Best Supplements for Women Over 40: Hormones, Bone Health and Energy

What Changes for Women After 40

The decade from 40 to 50 brings significant physiological transitions:

- Perimenopause begins (average age 45): fluctuating oestrogen and progesterone - Bone density accelerates its decline: women lose 1–2% of bone density annually in the 5 years before menopause - Iron status changes: for most women, heavy periods ease in their mid-40s; iron needs may decrease - Thyroid issues become more common: Hashimoto's thyroiditis peaks in women aged 30–50 - Sleep disruption intensifies: often the first symptom of perimenopause onset - Mood and anxiety fluctuations linked to progesterone decline

Priority 1: Vitamin D3 + K2 (Bone Protection)

Women face a far higher risk of osteoporosis than men — 50% of women over 50 will experience an osteoporotic fracture in their lifetime. Bone protection starts NOW, in the 40s, before oestrogen drops precipitously.

Vitamin D3 ensures calcium absorption (without it, you absorb only 10–15% of dietary calcium). K2 (MK-7) ensures that calcium is deposited in bone, not arteries.

Evidence: Multiple RCTs show D3 + K2 combination superior to D3 alone for bone mineral density. Japanese prescription protocol for osteoporosis uses high-dose K2.

Dose: 2,000 IU D3 + 100–200mcg MK-7 daily.

Priority 2: Magnesium Glycinate (Sleep + PMS + Mood)

Oestrogen fluctuations in perimenopause disrupt GABA signalling, making anxiety and sleep disruption characteristic symptoms. Magnesium restores GABA activity and reduces cortisol.

Additional benefits specifically relevant to women: - PMS reduction: Multiple RCTs show magnesium reduces premenstrual anxiety, bloating, and cramps - Migraine prevention: Women are 3× more likely to suffer migraines; magnesium reduces frequency - Blood pressure: Relevant as cardiovascular risk rises after menopause

Dose: 300–400mg magnesium glycinate, evening.

Priority 3: Omega-3 (EPA + DHA)

Omega-3 addresses multiple perimenopausal concerns: - Reduces hot flash frequency (meta-analyses show modest benefit) - Reduces systemic inflammation (oestrogen normally acts as an anti-inflammatory) - Reduces depression risk (omega-3 supplementation shows significant antidepressant effects, relevant as depression risk increases in perimenopause) - Supports joint health (joint pain is common in perimenopause)

Dose: 2–4g EPA+DHA daily.

Priority 4: Calcium — From Food First, Supplements Cautiously

Women over 40 need 700–1,200mg calcium daily for bone health. The priority is food sources:

| Food | Calcium | |------|---------| | Cow's milk (200ml) | 240mg | | Yoghurt (150g) | 200mg | | Hard cheese (30g) | 225mg | | Fortified plant milk (200ml) | 240mg | | Canned sardines with bones (100g) | 380mg | | Edamame (100g) | 60mg |

If dietary intake is under 700mg/day, consider 500mg calcium supplement. Avoid high-dose calcium supplements (1,000–1,200mg) without adequate D3 and K2 — the cardiovascular concern from calcium without directional proteins is real.

Priority 5: Iron (Context-Dependent)

Iron needs vary significantly in this decade: - Heavy periods: Many perimenopausal women experience heavier periods before menopause — test ferritin - Lighter periods or no periods: Iron needs decrease; supplementing iron without deficiency may cause harm

Get a ferritin test before supplementing iron. Target ferritin > 50 μg/L.

Optional but Valuable

Ashwagandha (KSM-66): For stress and cortisol management during perimenopause. 300mg twice daily. Clinical trials specifically in menopausal women show improved quality of life and sleep.

Black Cohosh: Modest but consistent evidence for hot flash reduction. 20–40mg standardised extract twice daily. Not a phytoestrogen — works via serotonergic mechanism.

B-complex (with methylfolate): B vitamins support energy metabolism, methylation, and nervous system function. Particularly relevant if stressed, fatigued, or vegetarian. Choose methylated forms (methylcobalamin, methylfolate).

CoQ10: Energy production declines after 40. CoQ10 is mitochondrial fuel. 100–200mg ubiquinol daily. Particularly relevant for fatigue.

The Foundation Stack

| Supplement | Dose | Why | |-----------|------|-----| | Vitamin D3 + K2 | 2,000 IU + 100–200mcg | Bone + calcium direction | | Magnesium glycinate | 300–400mg | Sleep, PMS, mood | | Omega-3 | 2–4g EPA+DHA | Inflammation, mood, hot flashes | | Iron | Test first | Only if ferritin < 30 |

Perimenopause is a medical transition. Discuss HRT with your GP — it remains the most effective treatment for vasomotor symptoms and bone protection.