The Complete Women’s Health
Supplement Guide

Mineral — Critical for menstruating women

Iron is the most common nutrient deficiency worldwide, and menstruating women lose 15-30 mg of iron per cycle. Iron is essential for oxygen transport (hemoglobin), energy production (mitochondrial cytochromes), thyroid hormone synthesis, and neurotransmitter production (dopamine, serotonin). Low ferritin causes fatigue, brain fog, hair loss, cold intolerance, restless legs, and exercise intolerance long before anemia appears on standard blood work.

• •Test ferritin, not just hemoglobin — ferritin below 30 ng/mL warrants supplementation
• •Optimal ferritin for women: 50-100 ng/mL (most labs list 12+ as 'normal' which is too low)
• •Iron bisglycinate is the best-tolerated form — significantly less GI distress than ferrous sulfate
• •Take with vitamin C (200 mg) to increase absorption by up to 67%
• •Avoid taking with calcium, coffee, or tea — these inhibit iron absorption by 40-60%
• •Take on an empty stomach or with a small vitamin-C-rich snack for maximum absorption
• •Heavy menstrual bleeding, endometriosis, and fibroids dramatically increase iron requirements

WHO Global Nutrition Targets: Anaemia, 2025; Tolkien et al., PLoS ONE, 2015

B-Vitamin — Essential for all women of reproductive age

Folate is essential for DNA synthesis, methylation, red blood cell formation, neural tube development in pregnancy, and neurotransmitter production. Approximately 40-60% of the population carries MTHFR gene variants that impair conversion of folic acid to its active form (5-MTHF). Supplementing with methylfolate bypasses this genetic bottleneck. Folate deficiency is linked to neural tube defects, anemia, depression, elevated homocysteine, and impaired detoxification.

• •Choose methylfolate (5-MTHF) over synthetic folic acid — active form that bypasses MTHFR variants
• •400 mcg minimum for all women of childbearing age; 800 mcg if planning pregnancy
• •Begin supplementation at least 3 months before conception for neural tube protection
• •Folate works synergistically with B12 — always supplement together
• •Supports healthy homocysteine metabolism (elevated homocysteine is an inflammatory and cardiovascular risk factor)
• •Food sources: dark leafy greens, liver, lentils, asparagus, avocado — but absorption is only ~50% from food
• •Excess unmetabolized folic acid (from fortified foods + synthetic supplements) may have adverse effects — another reason to choose methylfolate

Crider et al., Annual Review of Nutrition, 2012; Bailey & Ayling, PNAS, 2009

Fat-Soluble Vitamins — Deficient in 40-75% of women globally

Vitamin D is a steroid hormone that regulates over 1,000 genes — including those governing immunity, bone density, mood, hormonal balance, and inflammation. Women are at higher risk of deficiency due to more time indoors, higher body fat (D is sequestered in fat tissue), and sunscreen use. Low vitamin D is strongly linked to osteoporosis, autoimmune conditions (Hashimoto's, lupus, MS), depression, PMS, PCOS, and increased cancer risk. Vitamin K2 (MK-7) is the critical cofactor that directs calcium to bones rather than arteries.

• •Test 25-OH vitamin D — optimal range is 50-80 ng/mL (most labs list 30+ as 'sufficient' which is suboptimal)
• •5,000 IU daily is a reasonable starting dose for most deficient women — adjust based on blood levels
• •Always pair D3 with K2 (MK-7) to prevent arterial calcification and maximize bone benefit
• •Take with your fattiest meal — D3 is fat-soluble and absorption increases 50% with dietary fat
• •Vitamin D supports progesterone production and may improve fertility outcomes
• •Critical for bone density — especially important to optimize before perimenopause
• •Immune modulator: reduces risk of autoimmune flares and upper respiratory infections

Holick, NEJM, 2007; Knapen et al., Thrombosis and Haemostasis, 2015

Mineral — Deficient in over 50% of women

Magnesium is involved in over 600 enzymatic reactions including energy production, muscle relaxation, nervous system regulation, blood sugar management, and hormone synthesis. It is the single most impactful mineral for PMS — reducing cramps, bloating, mood swings, headaches, and breast tenderness. Magnesium also supports sleep quality, stress resilience (regulates the HPA axis), blood pressure, and bone density (60% of body magnesium is stored in bone).

• •Glycinate form for sleep, anxiety, cramps, and PMS — best overall form for women
• •Threonate for cognitive function and brain fog — only form proven to cross the blood-brain barrier
• •Avoid oxide form — only 4% absorption and causes GI distress
• •Split dosing (morning + evening) maintains more stable blood levels
• •Magnesium needs increase during luteal phase — many women benefit from higher doses days 15-28
• •Depleted by stress, caffeine, alcohol, and oral contraceptives
• •RBC magnesium is a more accurate test than serum magnesium (serum only reflects 1% of total body magnesium)

Parazzini et al., Magnesium Research, 2017; Quaranta et al., Eur Rev Med Pharmacol Sci, 2007

Essential Fatty Acids — Anti-inflammatory foundation for hormonal health

Omega-3 fatty acids are structural components of every cell membrane in your body and are direct precursors to anti-inflammatory signaling molecules (resolvins, protectins). For women specifically, omega-3s reduce menstrual pain as effectively as ibuprofen in clinical trials, support mood and reduce risk of perinatal depression, improve skin and hair quality, protect cardiovascular health (women's #1 killer), and support fetal brain development during pregnancy. The modern diet is severely deficient in omega-3s relative to pro-inflammatory omega-6s.

• •EPA is the primary anti-inflammatory component — look for high-EPA formulas for PMS and mood
• •DHA is critical for brain health and is the dominant omega-3 in brain tissue and retina
• •Triglyceride form absorbs 70% better than ethyl ester form — check the label
• •Take with a fat-containing meal for maximum absorption
• •Menstrual pain: 1,000-2,000 mg EPA shown to reduce dysmenorrhea as effectively as NSAIDs
• •Pregnancy: 300-600 mg DHA daily recommended for fetal brain and retinal development
• •Test your omega-3 index — target > 8% (most Americans are 4-5%)

Harel et al., Am J Obstet Gynecol, 1996; Saldeen & Saldeen, Women's Health, 2004

Mineral — Bone density and neuromuscular function

Women begin losing bone density in their 30s, accelerating dramatically during perimenopause and menopause when estrogen — the primary bone-protective hormone — declines. Peak bone mass is built by age 30, making early optimization critical. Calcium is also essential for muscle contraction, nerve signaling, and blood clotting. However, calcium supplementation without K2 and D3 can increase cardiovascular risk by depositing calcium in arteries rather than bones.

• •Food first: dairy, sardines with bones, broccoli, bok choy, fortified foods
• •If supplementing, calcium citrate is better absorbed than carbonate (especially on an empty stomach)
• •Never take more than 500 mg at once — absorption drops dramatically above this threshold
• •MUST pair with vitamin D3 (for absorption) and K2 MK-7 (for proper calcium direction)
• •Weight-bearing exercise is equally important for bone density — supplements alone are not enough
• •Women need 1,000 mg/day ages 19-50 and 1,200 mg/day after 50 (total from food + supplements)
• •Separate calcium doses from iron supplements by at least 2 hours — calcium inhibits iron absorption

Weaver et al., Osteoporosis International, 2016; Bolland et al., BMJ, 2010

Hormones: Estrogen and progesterone at their lowest. Prostaglandins trigger uterine contractions to shed the lining. Iron is lost through menstrual blood.

Nutrition tip: Warm, iron-rich foods: bone broth, red meat, lentils, dark chocolate, cooked leafy greens. Anti-inflammatory focus. Increase caloric intake slightly — your body is doing repair work.

Hormones: Estrogen rises steadily as follicles mature. FSH (follicle-stimulating hormone) drives follicular development. Energy and mood typically improve. Estrogen supports serotonin and dopamine production.

Nutrition tip: Light, fresh foods: salads, fermented foods, lean proteins, sprouted grains. Estrogen supports insulin sensitivity in this phase, so you can handle carbohydrates better. Great time for intermittent fasting if you practice it.

Hormones: LH surge triggers ovulation. Estrogen peaks. Testosterone briefly spikes. Energy, libido, and confidence are typically at their highest. Brief window of fertility.

Nutrition tip: Cruciferous vegetables (broccoli, cauliflower, kale) to support estrogen detox. Antioxidant-rich berries and colorful vegetables. Adequate protein to support the metabolic demands of ovulation.

Hormones: Progesterone rises as the corpus luteum forms, then falls if no pregnancy occurs. This progesterone drop triggers menstruation. PMS symptoms arise from the estrogen-to-progesterone ratio and neurotransmitter shifts. Basal metabolic rate increases 100-300 calories/day.

Nutrition tip: Higher calorie intake (honor the 100-300 cal/day increase in metabolic rate). Complex carbohydrates to support serotonin (sweet potato, oats, quinoa). Magnesium-rich foods. Reduce caffeine and alcohol, which worsen PMS. Do not restrict food in this phase — it backfires hormonally.

Thyroid peroxidase (TPO) — the enzyme that produces thyroid hormones — is iron-dependent. Low ferritin impairs T4 synthesis and T4-to-T3 conversion. Women with iron deficiency are significantly more likely to have subclinical hypothyroidism.

The essential building block of thyroid hormones (T3 has 3 iodine atoms, T4 has 4). Deficiency causes goiter and hypothyroidism. However, excess iodine can trigger Hashimoto's flares in susceptible individuals. Test before supplementing aggressively.

Required for the deiodinase enzymes that convert T4 (inactive) to T3 (active). Also protects the thyroid from oxidative damage (selenoproteins like glutathione peroxidase). Reduces TPO antibodies in Hashimoto's patients by 20-40% in clinical trials.

Required for TSH synthesis in the pituitary and for T3 binding to nuclear receptors. Zinc deficiency impairs thyroid function at multiple levels. Also supports immune regulation relevant to autoimmune thyroid conditions.

Modulates immune function and reduces autoimmune thyroid antibodies. Women with Hashimoto's have significantly lower vitamin D levels than controls in nearly every study. Supplementation reduces TPO and thyroglobulin antibodies.

Cofactor for T4-to-T3 conversion. Deficiency can mimic hypothyroid symptoms (fatigue, brain fog, constipation, cold intolerance). Often overlooked in thyroid evaluations.

Iron deficiency without anemia affects 30% of menstruating women globally and causes fatigue, cognitive impairment, and exercise intolerance even when hemoglobin is normal.

WHO Global Nutrition Report, 2025

Myo-inositol (4,000 mg/day) improves ovulation rates by 65% and reduces testosterone by 35% in women with PCOS, with efficacy comparable to metformin and fewer side effects.

Unfer et al., Gynecological Endocrinology, 2017

DIM supplementation increases the 2:16 hydroxyestrone ratio by 47%, shifting estrogen metabolism toward the protective pathway in postmenopausal women.

Dalessandri et al., Nutrition and Cancer, 2004

Magnesium supplementation reduces PMS symptom scores by 34% after just 2 menstrual cycles, with the greatest improvements in mood, water retention, and pain.

Quaranta et al., European Review for Medical and Pharmacological Sciences, 2007

Women who maintain vitamin D levels above 40 ng/mL have a 67% lower risk of all cancers compared to those below 20 ng/mL.

McDonnell et al., PLoS ONE, 2016

Omega-3 supplementation (1,800 mg/day) reduces menstrual pain intensity by 37% and decreases NSAID use by 50% in young women with primary dysmenorrhea.

Harel et al., American Journal of Obstetrics and Gynecology, 1996

Women lose up to 20% of bone density in the first 5-7 years after menopause. Calcium + D3 + K2 supplementation combined with resistance training reduces this loss by up to 50%.

Weaver et al., Osteoporosis International, 2016; Knapen et al., 2015

Selenium supplementation (200 mcg/day) reduces TPO antibodies by 20-40% in women with Hashimoto's thyroiditis over 6 months.

Toulis et al., Thyroid, 2010 (meta-analysis of 4 RCTs)