How Is Rosa damascena Rose Oil Used in Human Studies?

How Rosa damascena Rose Oil Has Been Used in Human Studies: Inhalation, Topical Application, and Standardized Preparations

Understanding the findings of scientific research on rose oil requires more than simply reading that a study reported beneficial results.

To interpret a study accurately, we need to examine which product was used, how it was administered, the amount applied, the duration of exposure, and the comparison or control group.

In human studies, Rosa damascena essential oil has most commonly been investigated through controlled inhalation.

Some researchers have examined its effects when diluted in a carrier oil and applied to the skin. A smaller number of studies have investigated specially prepared, standardized oral formulations.

Each route of administration creates a different type of exposure. Therefore, findings obtained through inhalation cannot automatically be applied to topical use, and results from skin application cannot be extended to oral consumption.

Rose Academy Insight

A scientific research protocol is not a guide to everyday use.

The quantities, concentrations, and exposure times used in clinical studies are selected to answer specific research questions.

They should not be interpreted as universally safe or effective recommendations for personal use.

1. Why Must the Rose Preparation Be Clearly Identified?

In scientific literature, terms such as "rose oil," "rose essence," "rose extract," and "rose water" are sometimes used inconsistently.

However, these terms do not necessarily describe the same material.

Different rose-derived preparations can vary considerably in their chemical composition, concentration, and intended applications.

The word "rose" in a scientific paper's title does not necessarily mean that the researchers used pure Rosa damascena essential oil.

The methods section should provide enough information to identify the research material accurately.

Important details include:

• Botanical identity

• Production or extraction method

• Chemical characterization

• Concentration

• Route of administration

Without this information, interpreting or reproducing the results becomes more difficult.

2. Which Routes of Administration Have Been Investigated in Human Studies?

A comprehensive review of clinical evidence published in 2017 examined 13 human studies involving rose oil, with a combined total of 772 participants.

According to Mohebitabar and colleagues, the studies primarily investigated two routes of administration:

1. Inhalation aromatherapy

2. Topical application

The studies mainly focused on pain perception, anxiety, physiological relaxation, and psychological outcomes.

Although several investigations reported favourable results, the review emphasized the need for larger studies and stronger research designs before definitive conclusions could be established.

Scientific reference:Mohebitabar et al., 2017 – Therapeutic Efficacy of Rose Oil: A Comprehensive Review of Clinical Evidence

3. Controlled Inhalation: The Most Commonly Studied Method

Controlled inhalation is one of the most frequently investigated methods of administering rose essential oil in human research.

In these studies, the oil may be:

• Applied to a cotton pad or piece of fabric.

• Placed at a specified distance from the participant.

• Released into the surrounding air using an aromatherapy device.

• Inhaled through normal breathing for a defined period.

The oil is generally not applied inside the nostrils or sprayed directly into the respiratory tract.

Which Variables Matter in an Inhalation Study?

For an inhalation study to be evaluated properly, researchers should describe:

• The botanical identity of the essential oil

• Whether the oil was pure or diluted

• The number of drops or volume used

• Whether the oil was applied to cotton, fabric, or a device

• The distance between the aromatic source and the participant's nose

• Duration of exposure

• Frequency of administration

• Room size and ventilation conditions

• The substance or procedure used in the control group

• Whether participants could recognize the fragrance

These details matter because the amount of fragrance reaching a participant can vary substantially depending on the experimental arrangement.

Why Is Blinding Difficult in Rose Aromatherapy Research?

Rose essential oil has a distinctive, recognizable fragrance.

This makes it difficult to prevent participants from identifying whether they are receiving the active aromatic intervention.

A participant who recognizes the smell of rose may correctly guess which research group they belong to.

That knowledge may influence expectations and, potentially, their reported experience.

As a result, the quality of blinding is an important consideration when evaluating aromatherapy studies.

4. A Clinical Study of Pain and Anxiety After Cesarean Delivery

A randomized clinical study published in 2020 investigated the effects of aromatherapy on pain and anxiety following cesarean delivery.

The study included 90 women divided into three groups:

• Damask rose essential oil

• Lavender essential oil

• Normal saline control

How Was Rose Oil Administered?

According to the reported research protocol:

1. Three drops of rose essential oil were applied to a piece of cotton.

2. The cotton was positioned approximately 10 cm from the participant's nose.

3. Participants inhaled the aroma for 30 minutes.

4. Pain and anxiety measurements were repeated after the intervention.

The study reported lower pain and anxiety scores in the rose and lavender groups compared with the control group.

Scientific reference:Abbasijahromi et al. – Clinical Study of Aromatherapy Following Cesarean Delivery

What Does This Study Demonstrate?

The research investigated the relationship between a specific, short-term inhalation protocol and reported pain and anxiety levels in a hospital setting.

It provides information about the intervention under the conditions studied.

What Does It Not Demonstrate?

The findings do not establish that:

• Rose essential oil treats the underlying physical causes of postoperative pain.

• Three drops represent the ideal dose for everyone.

• The same application is safe throughout pregnancy.

• Repeated or long-term inhalation is free from risk.

What the Science Tells Us

A reduction in reported pain intensity does not mean that the physical cause of the pain has been eliminated.

Pain is a complex experience influenced by physiological, psychological, and environmental factors.

The study measured changes in pain scores, not the disappearance of the underlying condition.

5. Rose Aromatherapy in Patients Receiving Hemodialysis

A clinical study published in 2017 investigated the effects of Damask rose essential oil aromatherapy on depression, anxiety, and stress scores among patients receiving hemodialysis.

Hemodialysis is a medical treatment used to remove waste products and excess fluid from the blood when kidney function is severely impaired.

Patients receiving regular hemodialysis may experience considerable physical and psychological stress.

How Was the Intervention Conducted?

The researchers used the following protocol:

• Damask rose essential oil was prepared at a concentration of 2%.

• Three drops of the preparation were applied to a piece of fabric.

• The fabric was attached to the participant's collar.

• Participants continued breathing normally for one hour.

• The intervention took place during dialysis sessions.

• The research continued for four weeks.

A total of 56 patients completed the study.

The researchers reported reductions in anxiety and stress scores in the rose aromatherapy group.

Scientific reference:Dehkordi et al., 2017 – Effects of Aromatherapy Using Damask Rose Essential Oil on Depression, Anxiety and Stress in Hemodialysis Patients

An Important Research Limitation

The control group did not receive an equivalent aromatic placebo administered through the same procedure.

Consequently, it was difficult to distinguish fully between:

• The effects associated with the rose fragrance

• Attention received during the intervention

• Participants' expectations

• Changes occurring naturally over time

These findings suggest that Damask rose aromatherapy may be worthy of further investigation.

However, they do not establish rose essential oil as a treatment for depression, anxiety disorders, or other medical conditions.

Rose Academy Insight

When evaluating an aromatherapy study, consider not only whether the intervention group improved, but also whether the comparison group received a sufficiently similar experience.

6. A Clinical Study of Renal Colic Pain

Renal colic is a form of severe pain commonly associated with kidney stones obstructing the urinary tract.

A randomized, double-blind, placebo-controlled study investigated the effects of rose oil aromatherapy in 80 patients experiencing renal colic.

How Was the Study Designed?

Both groups received standard medical pain treatment.

In addition:

• The intervention group received aromatherapy using a 2% rose oil preparation.

• The control group received a placebo.

Pain intensity was evaluated at three points:

1. Before treatment

2. Ten minutes after treatment

3. Thirty minutes after treatment

The researchers reported a greater reduction in pain scores in the group receiving rose oil aromatherapy alongside standard treatment.

Scientific reference:Ayan et al., 2013 – Investigating the Effect of Aromatherapy in Patients with Renal Colic

How Should the Results Be Interpreted?

The study suggests that rose oil aromatherapy may influence pain perception when used as an additional intervention alongside standard medical treatment.

However, rose oil was not used as a replacement for medical care.

It would therefore be incorrect to conclude that rose essential oil can independently treat renal colic or resolve kidney stones.

The Scientific Distinction

An intervention that influences pain scores is not necessarily a treatment for the condition causing the pain.

7. Topical Application: Investigating Effects Through Skin Contact

Some researchers have investigated rose essential oil when diluted in a carrier oil and applied to the skin.

This route of administration is more complex than it may initially appear.

During topical application, two types of exposure may occur simultaneously:

1. Skin contact with the applied preparation and its constituents.

2. Olfactory exposure as volatile aromatic compounds evaporate and are inhaled.

This means that changes observed following topical application may not necessarily result from skin contact alone.

Researchers who want to distinguish these pathways must consider how to control or minimize fragrance inhalation.

8. A Study of Topical Rose Oil and Relaxation

A controlled study published in 2009 investigated the physiological and emotional effects of topical rose oil application in 40 healthy young adults.

The researchers attempted to examine skin-related exposure while minimizing the influence of the fragrance.

How Was the Preparation Made?

The reported protocol included the following conditions:

• Rose essential oil was prepared at a concentration of 20% in sweet almond oil.

• Each participant received 1 mL of the preparation.

• The preparation was applied to the lower abdominal area.

• Participants massaged the area for five minutes.

• The application site was covered with a film to reduce evaporation.

• Participants wore respiratory masks supplying fresh air to minimize exposure to the aroma.

The researchers measured several physiological and emotional outcomes, including:

• Blood pressure

• Breathing rate

• Pulse rate

• Skin temperature

• Participants' subjective emotional state

The rose oil group showed certain physiological changes and reported feeling calmer and more relaxed.

Scientific reference:Hongratanaworakit, 2009 – Relaxing Effect of Rose Oil on Humans

Why Were Respiratory Masks Used?

The researchers wanted to investigate whether the observed responses could be associated with topical exposure rather than inhalation of the rose fragrance.

Without controlling olfactory exposure, it would have been difficult to distinguish between responses associated with skin application and those potentially influenced by the sense of smell.

This detail illustrates an important principle of experimental design:

A well-designed study must account for alternative explanations for the observed results.

However, minimizing fragrance exposure does not, by itself, establish the precise biological mechanism responsible for the observed changes.

9. Does a 20% Concentration Mean Rose Oil Is Safe for Everyday Skin Use?

No.

Although a 20% rose essential oil preparation was used in the study described above, this concentration must not be interpreted as a recommendation for daily cosmetic use.

There are several reasons:

• The application took place during a single experimental session.

• The participants were healthy individuals aged approximately 18–21.

• The application area and quantity were controlled.

• Participants were observed in a research environment.

• The purpose of the study was not to establish long-term skin safety.

• The risks of repeated exposure, irritation, and sensitization were not comprehensively investigated.

Essential oils are concentrated mixtures of chemical constituents.

Depending on their composition and concentration, they may cause irritation or allergic skin reactions.

A Common Misconception

Misconception: If a concentration was used in a scientific study, it must be safe for everyday use.

Scientific explanation: A research concentration is evaluated within the conditions of that particular experiment.

Determining safety for routine cosmetic use requires additional consideration of repeated exposure, application area, formulation, individual sensitivity, and potential sensitization.

Rose Academy Safety Note

Experimental concentrations should never be copied directly into personal skincare routines simply because they appeared in a published study.

10. Aromatherapy Massage: Why Is Interpretation More Complicated?

Some human studies have examined rose essential oil as part of an aromatherapy massage intervention.

However, this method introduces several variables that can influence the results simultaneously.

Changes observed after an aromatherapy massage may involve:

• The physical effects of massage

• Human touch

• A relaxing environment

• Perception of the rose fragrance

• Contact between the oil preparation and the skin

• Participants' expectations

Therefore, observing improvement in a group receiving a rose oil massage does not automatically demonstrate that rose oil alone produced the effect.

How Could a Stronger Study Be Designed?

To investigate the independent contribution of rose essential oil, researchers could compare several groups.

Such a design could help researchers distinguish the effects associated with massage, fragrance exposure, and the rose oil preparation.

Additional controls may still be necessary to address participants' expectations and differences between the intervention experiences.

Why Does This Matter?

Scientific studies should aim to determine not only whether a change occurred, but also which part of the intervention may have contributed to that change.

A favourable outcome after a combined intervention does not establish the independent effectiveness of every component.

11. Standardized Oral Preparations: A Different Research Category

Some more recent clinical investigations have examined capsules or specially prepared oral formulations containing rose oil.

However, these studies must not be interpreted as evidence that bottled essential oils sold for aromatherapy or cosmetic use can be swallowed safely.

A standardized oral research preparation is developed for a particular study.

Its composition, quantity, administration method, and participant monitoring may differ substantially from those of a commercial essential oil.

What Should Researchers Report?

For an oral preparation containing rose oil, important information includes:

• Exact amount of rose oil per capsule

• Total daily dose

• Carrier ingredients or excipients

• Chemical profile of the rose oil

• Purity and contaminant testing

• Duration of administration

• Medications used by participants

• Monitoring and reporting of adverse events

• Relevant safety assessments, including liver and kidney function when appropriate

These details are essential for interpreting the findings and assessing potential risks.

Why Is This Distinction Important?

A substance being described as "natural" or being used as a food flavouring does not mean that concentrated essential oil can be consumed freely or without risk.

Clinical findings from oral research apply to the specific:

• Preparation

• Dose

• Participant population

• Duration of use

They do not establish that adding drops of cosmetic-grade rose essential oil to drinking water is safe.

Rose Academy Safety Note

Research involving standardized oral preparations should never be interpreted as instructions to ingest essential oils intended for aromatic or cosmetic use.

12. Which Outcomes Have Been Measured in Human Rose Oil Studies?

Human investigations involving rose essential oil have examined a variety of physiological and psychological outcomes.

These include:

• Self-reported pain intensity

• State anxiety scores

• Depression and stress questionnaires

• Heart rate

• Blood pressure

• Respiratory rate

• Skin temperature

• Sleep quality

• Emotional relaxation

• Requirements for analgesic medication

These outcomes do not all provide the same type of evidence.

Subjective Measurements

Pain, anxiety, and relaxation are often measured using questionnaires or numerical rating scales completed by participants.

These outcomes are important because they describe the participant's experience.

However, they may also be influenced by expectations, the surrounding environment, and interactions with researchers.

Objective Measurements

Blood pressure, heart rate, respiratory rate, and skin temperature can be measured using instruments.

These measurements provide physiological information.

Nevertheless, they may also change in response to:

• Rest

• Room temperature

• Talking

• Physical movement

• Emotional arousal

• Other environmental conditions

Why Should Researchers Consider Both?

A more informative interpretation may be achieved when subjective and objective measurements are examined together, supported by appropriate control groups.

However, objective measurements are not automatically evidence of a specific treatment effect.

Their relevance depends on the study design and the scientific question being investigated.

13. The Placebo Challenge in Rose Fragrance Research

One of the most important methodological challenges in aromatherapy research is blinding.

In a pharmaceutical study, it may be possible to produce a placebo tablet that looks and tastes similar to the active product.

With aromatic substances, this is considerably more difficult.

Rose essential oil has a strong and recognizable fragrance.

Participants who smell rose may suspect that they are receiving the active intervention.

This awareness may influence:

• Expectations

• Feelings of relaxation

• Pain ratings

• Interactions with researchers

Consequently, even when an aromatherapy study is described as double-blind, readers should examine whether effective blinding was realistically achieved.

What Is the Placebo Effect?

The placebo effect involves changes in a person's experience or responses that can be influenced by expectations and the context of an intervention.

It does not necessarily mean that the person's experience is imaginary or invalid.

Rather, it can make it difficult to determine how much of an observed change is attributable to:

• The chemical or sensory characteristics of the rose oil

• The participant's expectations

• The research environment

• Other components of the intervention

Scientific Perspective

Recognizing the influence of expectations does not diminish the importance of a participant's experience. It helps researchers interpret what may have contributed to the observed outcome.

14. Why Is Chemical Analysis of the Research Material Important?

The chemical composition of Rosa damascena essential oil can vary according to several factors.

These include:

• Geographical origin

• Harvest timing

• Time between harvesting and processing

• Fermentation-related changes

• Distillation equipment and technology

• Distillation duration

• Storage conditions

• Age of the essential oil

• Whether the product is pure or blended

Rose essential oil may contain constituents such as:

• Citronellol

• Geraniol

• Nerol

• Linalool

• Farnesol

• Eugenol

• Methyleugenol

Their relative proportions may differ between samples.

Why Does GC-MS Analysis Matter?

Gas chromatography–mass spectrometry (GC-MS) is an analytical technique used to separate, detect, and help identify chemical constituents.

For essential oils, GC-MS can provide valuable information about the volatile chemical profile of a sample.

If a clinical study does not adequately characterize the rose oil used, reproducing the experiment with another oil sample becomes more challenging.

Two products labelled Rosa damascena essential oil may not have identical chemical profiles.

Consequently, a clinical result obtained with one preparation cannot automatically be applied to every rose oil whose composition is unknown.

Rose Academy Insight

Botanical identification and chemical characterization are essential elements of reproducible research involving natural products.

15. Strengths and Limitations of Human Rose Oil Studies

The clinical literature on rose essential oil contains several valuable research approaches.

However, recurring methodological limitations should be considered when interpreting the results.

These limitations do not necessarily invalidate the findings.

Instead, they help determine the level of confidence that can reasonably be placed in the conclusions.

A positive result from a small, short-term study may justify further research without establishing broad clinical effectiveness.

16. Can Scientific Findings Be Applied to Everyday Use?

Scientific findings may inform our understanding of rose essential oil, but research protocols should not be copied directly into personal use.

What Do the Studies Help Us Understand?

Published human research indicates that:

• Rose essential oil has most frequently been investigated through controlled inhalation.

• In topical studies, it has generally been incorporated into carrier oil preparations.

• Application quantities, concentrations, and exposure times have been defined within research protocols.

• Some studies have reported favourable findings involving pain perception, anxiety, and relaxation.

• Stronger studies are needed to establish consistent effectiveness and long-term safety.

What Cannot Be Concluded?

The existing findings do not demonstrate that:

• A single amount or concentration is ideal for everyone.

• Undiluted rose essential oil can be applied directly to the skin without risk.

• Using more oil produces greater benefits.

• Rose essential oil independently treats a medical condition.

• The findings from one rose preparation apply to all rose-derived products.

An Important Principle

Scientific evidence should guide understanding, not be converted into personal dosing instructions without an appropriate safety assessment.

17. Ten Questions to Ask When Reading a Rose Oil Study

Before accepting a scientific claim about rose essential oil, consider the following questions.

1. Was the material actually Rosa damascena essential oil?

2. How was the oil produced?

3. Was its chemical composition analysed?

4. Was the oil used undiluted or in a diluted preparation?

5. Which route of administration was investigated?

6. Were the amount, concentration, and exposure duration clearly reported?

7. Was there an appropriate control or placebo group?

8. Could participants have identified their group through the fragrance?

9. Were the outcomes subjective, objective, or both?

10. How were adverse events and safety monitored, and for how long?

If several of these questions cannot be answered from the methods and results sections, the study's conclusions should be interpreted more cautiously.

The Rose Academy Research Checklist

Which rose preparation? Which chemical profile? Which administration route? Which dose? Which research outcome? Which limitations?

18. Frequently Asked Questions

How has rose essential oil most commonly been used in scientific studies?

Controlled inhalation is among the most frequently studied methods.

Researchers have administered the fragrance through cotton, fabric, or aromatherapy devices for specified periods under controlled conditions.

Have researchers applied undiluted rose essential oil directly to the skin?

Topical studies have generally investigated preparations diluted in carrier oils.

Although some experimental studies have used relatively high concentrations, these should not be interpreted as recommendations for everyday cosmetic use.

Are three drops of rose oil suitable for everyone?

No.

The number of drops reported in a study describes the research protocol, not a universally appropriate dose.

The concentration, dropper design, exposure duration, individual health status, and method of administration may differ.

Can rose essential oil treat pain?

Some human studies have reported reductions in pain scores following rose oil aromatherapy.

However, rose oil was not used as a replacement for established medical treatment in the studies discussed.

The available findings are insufficient to establish rose essential oil as an independent treatment for pain or the medical conditions causing it.

Do studies involving rose oil capsules mean that essential oil is safe to drink?

No.

A standardized oral research formulation is not equivalent to concentrated essential oil sold for cosmetic or aromatherapy purposes.

The safety of one preparation and dose cannot automatically be extended to another.

19. Key Takeaways

Human studies involving Rosa damascena essential oil have investigated three principal categories of exposure:

1. Controlled inhalation using cotton, fabric, or aromatherapy equipment.

2. Topical application involving rose oil preparations in a carrier oil, including some massage-based interventions.

3. Standardized oral research preparations developed for specific clinical investigations.

Controlled inhalation has been particularly prominent in the research literature.

Some investigations have reported favourable outcomes relating to pain perception, anxiety, and relaxation.

However, many studies have involved relatively small participant groups, short observation periods, and differing experimental protocols.

These variations make it difficult to establish a single standardized approach for everyday use.

The Central Scientific Conclusion

Human research involving Rosa damascena essential oil suggests that controlled inhalation and certain topical applications are worthy of further investigation for their potential influence on pain perception, anxiety, and relaxation. However, a universally safe and effective standard dose has not been established.

Conclusion: Understanding Research Methods Before Applying the Findings

In scientific investigations, rose essential oil has not simply been administered without defined conditions.

Researchers have selected the product, quantity, route of administration, exposure duration, and participant population according to specific study protocols.

Among the available human studies, controlled inhalation has been one of the most common approaches.

Topical investigations have generally used rose oil in carrier oil preparations, while oral research has involved specially prepared formulations intended for defined experimental conditions.

The available findings suggest that rose essential oil remains an interesting subject for research into relaxation, anxiety, and pain perception.

However, scientific research concentrations and exposure protocols should not be converted directly into everyday use instructions.

Each finding must be interpreted in relation to the exact preparation, dose, administration route, research population, and outcomes investigated.

Understanding how a botanical preparation was studied is just as important as understanding what the researchers discovered.

Scientific References

1. Mohebitabar, S., et al. (2017). Therapeutic efficacy of rose oil: A comprehensive review of clinical evidence.
   PubMed – PMID: 28748167

2. Abbasijahromi, A., et al. Clinical research on Damask rose aromatherapy following cesarean delivery.
   PubMed – PMID: 31730539

3. Ayan, M., et al. (2013). Investigating the effect of aromatherapy in patients with renal colic.
   PubMed – PMID: 23428085

4. Hongratanaworakit, T. (2009). Relaxing effect of rose oil on humans.
   Original Journal Publication

5. Dehkordi, A. K., et al. (2017). Effects of aromatherapy using the Damask rose essential oil on depression, anxiety and stress in hemodialysis patients: A clinical trial.
   Research Publication

6. Cosmetic Ingredient Review. (2022). Safety Assessment of Rosa damascena-Derived Ingredients.
   CIR Safety Assessment Document

Akita Rose Academy — Exploring Rosa damascena through botanical knowledge, clinical research, and responsible interpretation of scientific evidence.