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96% reported improvement in premenstrual symptoms: inside Evelyn’s 90-day Consumer Study
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Summary
To better understand how people experience Evelyn over time, we conducted a 90-day consumer study with 85 participants who had used the product consistently for at least three months. The study assessed changes in emotional, cognitive, and physical premenstrual symptoms across multiple cycles. Here is what we found.
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Headline findings — 90-day consumer study (n=85)
96%
reported overall improvement in symptom severity after 3 months
65%
reported improvement within the first month of use
Why we ran a consumer study on PMS and PMDD symptoms
For many people, PMS and PMDD are still framed as something to simply tolerate - mood swings, fatigue, irritability, anxiety, pain. But premenstrual symptoms rarely appear in isolation. They can affect sleep, productivity, relationships, and overall wellbeing. Many people describe feeling like a different version of themselves for part of every month.
Despite how common this experience is, there is still a surprising lack of structured, real-world data on interventions designed to support cycle health.
That is why we conducted a 90-day consumer study with people using Evelyn consistently across multiple menstrual cycles. Our aim was simple: to understand whether people experienced meaningful changes in their symptoms over time - not in theory, and not in a laboratory setting, but in everyday life.
How the 90-day study worked
The study followed people who had been using Evelyn for at least three months, allowing us to assess changes across multiple cycles. Participants completed a structured questionnaire covering emotional, cognitive, and physical symptoms associated with PMS and PMDD, assessed using a framework aligned with the Daily Record of Severity of Problems (DRSP)* - a validated symptom-tracking method widely used in clinical research on PMS and PMDD.
Study details
- 85 participants who menstruate
- Minimum of 90 days of consistent use
- Structured symptom reporting across multiple cycles
- Symptom assessment aligned with the DRSP framework
🧠 An important note on study type: This was a real-world consumer study, not a placebo-controlled clinical trial. To date, no supplement brand has conducted a placebo-controlled clinical trial evaluating a combined supplement routine for PMS or PMDD. Most placebo-controlled research in this field has focused on individual ingredients. Real-world studies like this help capture how people actually experience symptom change across multiple cycles, and represent an important first step towards a stronger evidence base. Evelyn intends to support future placebo-controlled research on combined approaches to premenstrual health.
PMS and PMDD affect the whole body
Research has linked more than 150 symptoms to PMS and PMDD - spanning emotional wellbeing, cognitive function, sleep, digestion, physical discomfort, and behaviour. Evelyn groups premenstrual symptoms into nine core areas of cycle health. Participants reported improvements across every single category.
96%
Mood and emotional wellbeing
reported fewer mood swings or reduced emotional sensitivity
96%
Calm and stress regulation
reported feeling less anxious, tense, or on edge
90%
Overall sense of wellbeing
reported feeling less overwhelmed or out of control
87%
Social and relationship wellbeing
reported symptoms interfered less with relationships
81%
Energy and fatigue
reported feeling less tired or lacking in energy
79%
Focus and motivation
reported improved concentration and productivity
71%
Physical comfort
reported reduced bloating, breast tenderness, headaches, or muscle pain
69%
Sleep and rest
reported improved sleep patterns
56%
Appetite and cravings
reported reduced appetite disruption or fewer food cravings
Premenstrual symptoms do not just affect how people feel. They affect how people live, work, and relate to others. Seeing improvements across multiple areas of life highlights the importance of supporting the cycle as a whole system, rather than focusing on individual symptoms in isolation.
What this study was - and what it wasn't
This research represents structured real-world evidence from people using Evelyn over multiple cycles. It provides insight into how people report changes in their symptoms when using the product consistently over time.
However, it was not a placebo-controlled clinical trial. Consumer studies capture lived experience and real-world outcomes, but they should be interpreted alongside clinical research and ongoing investigation.
🌿 On transparency: At Evelyn, we believe transparency matters - particularly in women's health, where reliable data has historically been limited. We are committed to publishing our findings clearly and to supporting a higher standard of evidence in this category over time.
What happens next?
This study is the first step in building a stronger evidence base for premenstrual health. A full report - including methodology, symptom analysis, and detailed findings - will be published on the Evelyn website shortly.
Our goal is simple: raise the standard of evidence in a category that has historically been overlooked. Because when it comes to PMS, PMDD, and cycle health, people deserve clear information, transparent research, and better solutions.
* DRSP (Daily Record of Severity of Problems) is a clinically validated symptom-tracking tool commonly used in research on PMS and PMDD to assess changes in emotional and physical symptoms across the menstrual cycle.
Disclaimer: This content is for informational purposes only and is not intended as medical advice. Always speak to a qualified healthcare professional about any health concerns.
