Which food supplements for a course during chronic stress?
Quick summary
Yes, but within limits. A targeted course of ashwagandha, magnesium or B vitamins can support a body exposed to chronic stress, without replacing the behavioural levers or medical advice.
Key facts
Key points
- A course of supplements does not treat the cause of chronic stress but can ease the fatigue, irritability and associated sleep problems.
- Ashwagandha standardised to 5% withanolides, at doses of 125 to 600 mg/day for 8 to 12 weeks, is the active with the most solid clinical data in 2026.
- Magnesium bisglycinate, dosed between 200 and 400 mg/day, supports the nervous system and compensates for the increased urinary losses observed during periods of stress.
- Vitamins B1 and B2 significantly reduce perceived stress after 4 weeks at 100 mg/day, according to a randomised trial published in 2025.
In Switzerland, 23% of working people say they feel stressed at work, against 18% in 2012 according to the Federal Statistical Office. In the world of the food supplement, several targeted courses have been studied in people under chronic stress: ashwagandha, magnesium, B-group vitamins. This article details what they can and cannot do, over what duration and with which precautions.
Is a course of food supplements useful in case of chronic stress?
What can (and cannot) supplementation do in the face of chronic stress?
A course of food supplements can help reduce certain symptoms of chronic stress — fatigue, anxiety, nervousness, muscular tension, disturbed sleep — without acting on the cause of the stress itself. The stressor (workload, conflict, personal situation) remains to be tackled alongside a balanced diet and a good lifestyle. According to the 2022 Swiss Health Survey by the Federal Statistical Office, 23% of working Swiss adults say they are stressed at work, against 18% in 2012[7], and more than half of them show signs of emotional exhaustion[7]. A targeted product, in capsule or tablet form, then aims at helping to fight stress and supporting the body, never at masking the difficulty nor replacing medical care. Everyone is free to choose the solution that fits their needs, according to quality and tolerance criteria.
Which actives have solid clinical data in 2026?
Three families of actives stand out from the recent clinical trials: ashwagandha, magnesium and certain B-group vitamins. A meta-analysis published in June 2025 in BJPsych Open, covering 15 randomised trials and 873 patients, concludes that this adaptogenic plant (Withania somnifera) significantly reduces anxiety as measured by the Hamilton Anxiety Rating Scale[1]. A second meta-analysis published at the end of 2025 in Nutrition and Health on 8 trials and 488 adults shows a significant drop in cortisol — the main hormone of the stress response — but no clear effect on perceived stress as measured by the Perceived Stress Scale[1b], an important qualification for reading the expected benefits. Another randomised trial published in early 2026 in Trials, in 186 people under high stress, confirmed a drop in perceived stress after 60 days, both for full-spectrum ashwagandha and for a mix based on rhodiola, holy basil and schisandra[2]. Other leads such as saffron have thinner preliminary data. On the mineral side, EFSA officially recognises the contribution of magnesium to the normal functioning of the nervous system[8] and to the reduction of fatigue[8], two functions essential to the energy balance that are disturbed in case of prolonged stress.
How to structure an effective course against stress that lasts?
How long to expect to observe an effect on chronic stress?
A structured course for chronic stress generally lasts 8 to 12 weeks, with observable effects from 28 days. A shorter period is generally not enough to judge the real action of an active. A 2024 dose-response trial published in Nutrients in 98 adults under mild-to-moderate chronic stress showed a drop in the perceived stress score at 125, 250 or 500 mg/day of ashwagandha extract over 8 weeks, through a modulation of the hypothalamic-pituitary-adrenal axis[4]. Another trial published in 2025 in Advances in Therapy observed in 90 adults under non-chronic stress improvements in perceived stress and sleep quality from day 28 at 125 mg/day of Zenroot™, with progress up to day 84[3] — the effect on blood cortisol did not reach significance there, and the authors call for the results to be confirmed over a longer period to obtain the best signal in chronic stress.
Which doses and at what time of day?
The clinically studied doses vary according to the active: 125 to 600 mg/day of ashwagandha extract standardised to 1.5-5% withanolides[1], 200 to 400 mg/day of elemental magnesium (bisglycinate or citrate form preferably), and 100 mg/day of vitamins B1 and B2 according to a randomised 4-week trial published in 2025 in Nutrients[5] — a study that reduced perceived stress and improved sleep, without a measurable effect on anxiety. A formulation pairing skullcap, magnesium and chromium was also studied in 2025 in the Journal of Psychopharmacology over 15 days, with improvements in mood, concentration and cognition under stress[6]. The time of intake depends on the target: ashwagandha rather in the evening if the goal is sleep, magnesium in the late afternoon or before bedtime to favour relaxation and accompany the natural secretion of melatonin, B vitamins paired with breakfast to support the production of energy. These actives help to manage stress more steadily over the day. Only one solid rule: daily regularity takes precedence over the precise hour.
| Active | Common clinical dose | Typical course duration |
|---|---|---|
| Ashwagandha (standardised extract) | 125 to 600 mg/day | 8 to 12 weeks |
| Magnesium bisglycinate or citrate | 200 to 400 mg/day of elemental magnesium | 1 to 3 months |
| Vitamins B1 and B2 | 100 mg/day of each | 4 weeks minimum |
Which precautions before and during the course?
When is medical advice required before starting?
Medical advice is essential in case of antidepressant, anxiolytic, antihypertensive, anticoagulant or immunosuppressant treatment, as well as in case of pregnancy, breastfeeding, thyroid or autoimmune disease. This is the reason why a prior exchange with a doctor remains the first step. Ashwagandha modulates the hypothalamic-pituitary-adrenal axis[1] and may interfere with thyroid treatments. Magnesium can potentiate the effect of certain heart treatments. A 2024 trial published in Scientific Reports observed a reduction in depressive episodes after 8 weeks of a combination of gut probiotic + magnesium orotate + coenzyme Q10 in 120 adults with major depression[10], but under strict medical supervision by a healthcare professional. It is advisable to consult as soon as chronic stress is not improved after 4 to 6 weeks of a course, in order to reassess the most suitable solution for your physical and mental health.
Frequent mistake
Multiplying supplements during a stress course (ashwagandha + St John’s wort + 5-HTP for example) raises the risk of interactions and complicates the assessment of effectiveness. One main active at a time, at a studied dose, over a defined duration, remains the safest approach.
Which signs should make you stop the course?
Several warning signals justify stopping and consulting: persistent headaches, marked digestive problems, palpitations, abnormal daytime sleepiness, unexplained mood change, skin rash, or worsening of the initial symptoms. The 2025 national report on mental health published by the Swiss Health Observatory recalls that the symptoms of chronic stress overlap with those of depression and anxiety disorders[9]: a persistent sleep disturbance or a lasting loss of drive must be clinically assessed by a professional, not self-treated by prolonged supplementation. Finding a settled way of functioning again then goes through holistic care, according to the real needs of the person, rather than the addition of a new product.
- Appearance of palpitations, dizziness or high blood pressure during the course: stop and consult.
- No measurable improvement after 4 to 6 weeks at a studied dose: reconsider the approach.
- Dark thoughts, lasting loss of interest, a feeling of being stuck: this is no longer stress, contact a professional quickly.
Frequently asked questions on the course of supplements in case of chronic stress
Which food supplement is the most studied against chronic stress?
Ashwagandha (Withania somnifera) has, in 2026, the most solid clinical dossier. This adaptogenic plant modulates the hypothalamic-pituitary-adrenal axis and lowers cortisol, the stress hormone, at doses of 125 to 600 mg/day of standardised extract. A meta-analysis published in June 2025 in BJPsych Open, covering 15 randomised trials and 873 patients, confirms a significant reduction in anxiety under ashwagandha. A second meta-analysis published at the end of 2025 in Nutrition and Health (8 RCTs, 488 adults) confirms the drop in cortisol but qualifies the effect on perceived stress. Magnesium and B1-B2 vitamins also have relevant data but are less specifically targeted at chronic stress.
How long does it take to observe an effect from an anti-stress course?
The first measurable effects generally appear between 4 and 8 weeks. The body needs several weeks to integrate an active that modulates the stress axis and for the clinical markers (sleep, fatigue, perceived stress score) to improve. A 2025 trial on Zenroot™ observed a significant drop in the Perceived Stress Scale from day 28 at 125 mg/day, with a progressive improvement up to day 84. A course that is too short (less than 4 weeks) does not allow real effectiveness to be assessed.
Can you combine ashwagandha and magnesium in the same course?
Yes, this combination is coherent and widely used. Magnesium supports the nervous system and compensates for the increased urinary losses during periods of stress, while ashwagandha acts on the regulation of cortisol. Several clinically tested formulations combine adaptogens and magnesium, such as the 2025 trial published in the Journal of Psychopharmacology pairing skullcap, magnesium and chromium. The advice of a pharmacist or a doctor remains recommended to adjust doses and rule out interactions.
Is the course compatible with an antidepressant treatment?
Not without prior medical advice. Antidepressants (SSRIs, SNRIs, tricyclics) act on neurotransmitters and certain plants or supplements may interfere — St John’s wort and 5-HTP are notably contraindicated. Ashwagandha modulates the stress axis and serotonin, and magnesium can potentiate certain effects. A 2024 controlled trial published in Scientific Reports tested the combination of probiotics + magnesium orotate in major depression, but exclusively under medical supervision. Any course must be discussed with the prescribing doctor.
Which signs indicate a chronic stress that requires immediate medical advice?
Several signals exceed what a course can take on: persistent insomnia beyond several weeks, lasting loss of interest, dark thoughts, marked emotional exhaustion, frequent palpitations, or unexplained physical symptoms. The 2025 national report on mental health from the Swiss Health Observatory recalls that these signs may reflect an anxiety or depressive disorder that is not treated with supplements. In Switzerland, the general practitioner remains the first point of contact and can refer to a psychiatrist or psychotherapist if needed.
Sources and references
11 sources- Bachour G. et al. (2025). Effects of Ashwagandha Supplements on Cortisol, Stress, and Anxiety Levels in Adults: A Systematic Review and Meta-Analysis.
- Albalawi A.A. (2025). Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress – A systematic review and meta-analysis.
- McKinney et al. (2026). Effects of multi-herb and ashwagandha root formulas on stress modulation.
- Mahadevan et al. (2025). A New Ashwagandha Formulation (Zenroot™) Alleviates Stress and Anxiety.
- Pandit et al. (2024). Effects of Withania somnifera Extract in Chronically Stressed Adults.
- Tao et al. (2025). Impact of Vitamin B1 and Vitamin B2 Supplementation on Anxiety, Stress, and Sleep Quality.
- Dodd et al. (2025). Effects of a herbal supplement with magnesium and chromium on stressed individuals.
- Federal Statistical Office (2024). Working conditions and state of health between 2012 and 2022.
- EFSA NDA Panel (2010). Scientific Opinion on health claims related to magnesium.
- Swiss Health Observatory (2025). Mental health in Switzerland: evolution, promotion, prevention.
- Strodl et al. (2024). Probiotics and magnesium orotate for the treatment of major depressive disorder.