Why does menstruation increase your nutritional demands?
Menstruation is a normal physiological process, but it places real demands on the body's nutrient stores. Understanding those demands is the first step toward addressing them through diet and, where appropriate, supplementation.
The most obvious demand is iron. Menstrual blood loss is the primary route through which premenopausal women lose iron. Over the course of a year, this amounts to a significant cumulative loss that dietary intake alone often fails to replace — particularly in women with heavier periods or those following plant-based diets.
Beyond iron, hormonal fluctuations across the menstrual cycle influence the metabolism and turnover of several other micronutrients. Magnesium levels, for example, have been observed to fluctuate across the cycle, with lower levels reported during the luteal phase — the two weeks between ovulation and the start of a period. Calcium metabolism is similarly affected by cyclical changes in oestrogen and progesterone.
Vitamin B6 plays a role that is particularly relevant here. It is the only nutrient with the EU-authorised health claim "contributes to the regulation of hormonal activity" — a claim we will return to in detail below.
None of this means menstruation is a disease or disorder requiring treatment. It means that menstruating women have measurably higher requirements for certain nutrients, and that failing to meet those requirements can contribute to tiredness, low mood, and general depletion.
If you experience severe menstrual symptoms that interfere with daily life, speak to your GP. This article covers nutritional considerations, not medical treatment.
How common are nutrient deficiencies in menstruating women?
More common than most people realise. The National Diet and Nutrition Survey (NDNS) — the UK's most comprehensive dietary surveillance programme — paints a stark picture:
- Iron: 25% of women aged 19–64 have intakes below the Lower Reference Nutrient Intake (LRNI), the threshold below which deficiency is likely. Among girls aged 11–18, the figure rises to 49%.
- Magnesium: up to 53% of adolescent girls and 19% of young adults aged 20–29 fall below the LRNI.
- Calcium: 11% of women aged 19–64 and 19% of girls aged 11–18 have intakes below the LRNI.
A secondary analysis of NDNS data by Derbyshire (2018) confirmed that UK females are particularly vulnerable to multiple simultaneous micronutrient shortfalls — not just one nutrient falling short, but several at once. This compounding effect is important because the nutrients involved in energy metabolism and hormonal regulation work synergistically. A shortfall in one can amplify the consequences of a shortfall in another.
These are not marginal findings affecting a small subset of the population. They describe a substantial proportion of UK women whose nutrient intakes are below levels considered adequate for normal physiological function.
Which nutrients carry relevant EU-authorised claims?
Under EU Regulation 432/2012, retained in UK law, several nutrients carry authorised health claims that are directly relevant to the experiences commonly reported by menstruating women:
Vitamin B6 — "contributes to the regulation of hormonal activity." This is the cornerstone claim for this article. No other vitamin or mineral carries a hormone-related authorised health claim. Vitamin B6 also contributes to the reduction of tiredness and fatigue and to normal psychological function.
Iron — "contributes to the reduction of tiredness and fatigue" and "contributes to normal oxygen transport in the body." Directly relevant given the iron losses associated with menstruation.
Magnesium — "contributes to normal muscle function" and "contributes to the reduction of tiredness and fatigue." Magnesium also contributes to normal psychological function and to the normal functioning of the nervous system.
Calcium — "contributes to normal muscle function" and "contributes to normal energy-yielding metabolism."
These are not marketing claims. They are specific, evidence-reviewed statements that have been assessed and authorised by the European Food Safety Authority (EFSA) and are legally permitted for use in the UK.
What is the evidence for vitamin B6 and hormonal activity?
Vitamin B6 "contributes to the regulation of hormonal activity" — an authorised EU health claim based on B6's role as a coenzyme in amino acid metabolism and its involvement in the synthesis and metabolism of several neurotransmitters and steroid hormones.
The clinical evidence supports this regulatory role. Wyatt et al. (1999) conducted a systematic review published in the BMJ, analysing nine randomised controlled trials of vitamin B6 supplementation and premenstrual symptoms. The review found evidence of benefit, with an overall odds ratio of 2.32 for symptom improvement — meaning women taking B6 were significantly more likely to report improvement than those taking placebo.
Kashanian et al. (2007) also examined the effect of vitamin B6 supplementation on premenstrual emotional symptoms in a double-blind, randomised, placebo-controlled trial, and reported statistically significant differences in favour of B6 for emotional symptoms including irritability, tiredness, and mood changes.
The authorised claim and clinical evidence support a role for vitamin B6 in the regulation of hormonal activity. This makes B6 the single most relevant nutrient from a regulatory standpoint when discussing nutritional support during the menstrual cycle.
PARTICULAR uses pyridoxine hydrochloride — the established, well-absorbed form of B6 — at levels that support the authorised claim.
Why is iron especially important during menstruation?
Monthly blood loss is the primary cause of iron depletion in premenopausal women. Each millilitre of blood lost contains approximately 0.5 mg of iron. For women with average menstrual losses, this translates to a monthly iron cost that must be replaced through diet or supplementation. For women with heavier periods, the cumulative deficit can be substantial.
An important point that is often overlooked: you do not need to be anaemic to experience the effects of low iron. Serum ferritin — the marker of stored iron — can fall well below optimal levels while haemoglobin remains within the normal range. At these sub-clinical levels, fatigue is the most commonly reported symptom.
Verdon et al. (2003) demonstrated this in a double-blind, placebo-controlled trial of 144 non-anaemic women with unexplained fatigue. Those receiving iron showed a 29% reduction in fatigue scores compared to 13% in the placebo group, with the strongest effect in women whose ferritin was below 50 mcg/L.
Vaucher et al. (2012) replicated this in 198 non-anaemic menstruating women with low ferritin. Twelve weeks of iron supplementation decreased fatigue by almost 50% from baseline.
The form of iron matters for both absorption and tolerability. PARTICULAR uses ferrous gluconate, which offers a balance of bioavailability and gastrointestinal tolerance. Vitamin C contributes to normal iron absorption — an authorised claim — and is included alongside iron in PARTICULAR formulations. Copper contributes to normal iron transport in the body and supports the utilisation of absorbed iron.
For a detailed comparison of iron forms, see Iron Supplements: Forms, Absorption and How to Choose.
Does magnesium contribute to comfort during menstruation?
Magnesium "contributes to normal muscle function" — an authorised EU health claim. It also contributes to the reduction of tiredness and fatigue, normal psychological function, and the normal functioning of the nervous system. All four of these claims are relevant across the menstrual cycle.
Parazzini et al. (2017) conducted a comprehensive review of the evidence on magnesium and menstrual health. The review examined the role of magnesium across various aspects of menstrual function and noted that magnesium status appears to be a relevant nutritional factor in women's cyclical health.
Given that NDNS data shows a significant proportion of young women fall below recommended magnesium intakes, and that magnesium requirements may be higher during certain phases of the cycle, ensuring adequate magnesium intake is a practical nutritional consideration for menstruating women.
PARTICULAR uses magnesium citrate, a form with well-documented bioavailability compared to cheaper alternatives like magnesium oxide. If tiredness or poor sleep overlaps with your menstrual cycle, magnesium may be doubly relevant — see Magnesium for Sleep.
What role does calcium play?
Calcium "contributes to normal muscle function" — an authorised EU health claim. It also contributes to normal energy-yielding metabolism.
The clinical evidence for calcium and premenstrual symptoms is substantial. Thys-Jacobs et al. (1998) conducted a landmark multicentre, randomised, double-blind, placebo-controlled trial involving 497 women. Participants receiving 1,200 mg of calcium carbonate daily for three menstrual cycles showed a significant reduction in self-reported symptom scores compared to placebo, across all four symptom categories assessed: negative affect, water retention, food cravings, and pain.
Ghanbari et al. (2009) further examined calcium supplementation in a randomised controlled trial and similarly reported that calcium was associated with changes in self-reported premenstrual symptom scores.
Calcium metabolism is influenced by cyclical hormonal changes. Oestrogen plays a role in calcium homeostasis, and fluctuations across the cycle may affect calcium requirements. Vitamin D3 contributes to the normal absorption and utilisation of calcium — an authorised claim — making adequate vitamin D status an important cofactor.
PARTICULAR uses calcium carbonate and vegan-sourced cholecalciferol (vitamin D3 from lichen) to support both calcium intake and its utilisation.
Nutrients relevant to menstrual health
| Nutrient | EU-Authorised Claim | Form in PARTICULAR | Why It Matters During Menstruation |
|---|---|---|---|
| Vitamin B6 | Contributes to the regulation of hormonal activity | Pyridoxine Hydrochloride | The only nutrient with a hormone-related authorised claim |
| Iron | Contributes to the reduction of tiredness and fatigue | Ferrous Gluconate | Replaces iron lost through monthly blood loss |
| Magnesium | Contributes to normal muscle function | Magnesium Citrate | Levels fluctuate across the cycle; supports muscle function and reduces tiredness |
| Calcium | Contributes to normal muscle function | Calcium Carbonate | Metabolism influenced by cyclical hormonal changes |
| Vitamin D3 | Contributes to normal absorption and utilisation of calcium | Cholecalciferol (vegan, from lichen) | Supports calcium utilisation; widespread UK deficiency |
| Zinc | Contributes to normal fertility and reproduction | Zinc Bisglycinate | Supports reproductive health; also contributes to maintenance of normal hair |
| Folate | Contributes to the reduction of tiredness and fatigue | L-5-MTHF | Body-ready form; supports energy metabolism |
| Vitamin B12 | Contributes to the reduction of tiredness and fatigue | Methylcobalamin | Works synergistically with folate and B6 |
| Vitamin C | Contributes to normal iron absorption | L-Ascorbic Acid | Supports the absorption of supplemental and dietary iron |
| Copper | Contributes to normal iron transport in the body | Copper di-D-Gluconate | Supports utilisation of absorbed iron |
How does PARTICULAR personalise for menstrual health?
PARTICULAR is not a "period supplement." It is a personalised supplement service that accounts for the increased nutritional demands of menstruation as part of a broader assessment of your individual requirements.
The PARTICULAR questionnaire captures information about your menstrual status alongside dietary intake, lifestyle factors, health goals, and any dietary restrictions. This information is used to build a formula tailored to your specific profile.
In practice, this means:
- Iron dosing is adjusted based on menstrual blood loss risk, dietary iron intake, and other factors that affect iron status. A vegan woman with heavy periods will receive a different iron dose than an omnivore with lighter periods.
- Vitamin B6 is included at levels supporting the authorised claim "contributes to the regulation of hormonal activity."
- Magnesium, calcium, and supporting nutrients are dosed based on your dietary intake, lifestyle, and reported needs.
- Vitamin C and copper are included to support normal iron absorption and transport.
The result is a single daily serving of microgranules — not a handful of separate pills — manufactured in a GMP-certified facility in Germany. The entire formulation is vegan.
It is worth noting that PARTICULAR blocks users who are pregnant or breastfeeding at questionnaire level. If you are pregnant, planning pregnancy, or breastfeeding, the service is not available to you and you should seek specific prenatal guidance from your midwife or GP. For women who are not pregnant, see our guide to the best multivitamin for women for a broader overview.
Key takeaways
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Menstruation increases nutritional demands — particularly for iron, but also for magnesium, calcium, vitamin B6, and supporting nutrients. This is physiology, not pathology.
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Nutrient deficiencies are common in UK women. NDNS data shows 25% of women aged 19–64 fall below the LRNI for iron, and multiple simultaneous shortfalls are widespread.
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Vitamin B6 is the only nutrient with the EU-authorised claim "contributes to the regulation of hormonal activity." Clinical evidence, including a BMJ systematic review, supports this role.
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Iron supplementation can meaningfully reduce fatigue in non-anaemic women with low ferritin — you do not need to be anaemic to benefit.
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Magnesium contributes to normal muscle function, the reduction of tiredness and fatigue, and normal psychological function — all relevant claims for menstruating women.
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Calcium supplementation was associated with significant changes in self-reported premenstrual symptom scores in a large randomised controlled trial of 497 women.
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A personalised approach is more effective than a generic "women's supplement" because nutritional demands vary enormously based on menstrual status, diet, and lifestyle. Take the PARTICULAR questionnaire to see what your body actually needs.
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If you experience severe menstrual symptoms that interfere with daily life, consult your GP. Supplements address nutritional requirements — they are not a substitute for medical advice or treatment.
For more on managing tiredness and fatigue or understanding the best multivitamin for women, see our other evidence-based guides.
Sources cited in this article:
- Derbyshire E. "Micronutrient Intakes of British Adults Across Mid-Life: A Secondary Analysis of the UK National Diet and Nutrition Survey." Front Nutr. 2018;5:55.
- Wyatt KM, Dimmock PW, Jones PW, et al. "Efficacy of vitamin B-6 in the treatment of premenstrual syndrome: systematic review." BMJ. 1999;318(7195):1375-81.
- Kashanian M, Mazinani R, Jalalmanesh S, Babayanzad Ahari S. "Pyridoxine (vitamin B6) therapy for premenstrual syndrome." Int J Gynaecol Obstet. 2007 Jan;96(1):43-4.
- Quaranta S, Buscaglia MA, Meroni MG, et al. "Pilot study of the efficacy and safety of a modified-release magnesium 250 mg tablet (Sincromag) for the treatment of premenstrual syndrome." Clin Drug Investig. 2007;27(1):51-8.
- Verdon F, Burnand B, Stubi CL, et al. "Iron supplementation for unexplained fatigue in non-anaemic women: double blind randomised placebo controlled trial." BMJ. 2003;326(7399):1124.
- Vaucher P, Druais PL, Waldvogel S, et al. "Effect of iron supplementation on fatigue in nonanemic menstruating women with low ferritin: a randomized controlled trial." CMAJ. 2012;184(11):1247-54.
- Parazzini F, Di Martino M, Pellegrino P. "Magnesium in the gynecological practice: a literature review." Magnes Res. 2017;30(1):1-7.
- Thys-Jacobs S, Starkey P, Bernstein D, et al. "Calcium carbonate and the premenstrual syndrome: effects on premenstrual and menstrual symptoms. Premenstrual Syndrome Study Group." Am J Obstet Gynecol. 1998;179(2):444-52.
- Ghanbari Z, Haghollahi F, Shariat M, et al. "Effects of calcium supplement therapy in women with premenstrual syndrome." Taiwan J Obstet Gynecol. 2009;48(2):124-9.
- EU Commission Regulation 432/2012 — Authorised health claims made on foods.