The supplement stack

Binds GABA receptors in the brain, promoting calm and sleep onset. Regulates HPA axis (cortisol). Supports serotonin-to-melatonin conversion. Relaxes smooth muscle (helps with cramps and palpitations). Inadequate intake is common (estimates range 30–60% of women below RDA), and perimenopause increases demand.

●●●●● Strong
Well-established for sleep, anxiety, and muscular effects. Specific perimenopause RCTs are limited but mechanism-of-action evidence is robust. The glycinate form is the best-tolerated and most absorbable.

Sleep effects: 3–7 days. Anxiety reduction: 1–2 weeks. Full mineral repletion: 4–6 weeks.

Vitamin D (magnesium is required for D activation). L-theanine (amplifies calming effect). Progesterone at bedtime (complementary GABA mechanism).

Loose stools at high doses — reduce and titrate up. Glycinate form is the gentlest on digestion.

D3 acts as a steroid hormone precursor, binding nuclear receptors in nearly every tissue. Regulates calcium absorption, immune cell function, and neurotransmitter synthesis. K2 (MK-7) directs calcium to bones and teeth, keeping it out of arteries and soft tissue. Together they protect the skeletal and cardiovascular systems during the accelerated bone loss window.

●●●●● Rock solid
D3+K2 for bone density in peri/postmenopausal women is among the best-supported supplement interventions in medicine. Mainstream serum 25-OH-D target is 30–50 ng/mL; functional-medicine practitioners often aim higher at 50–70 ng/mL. Test before mega-dosing.

Serum levels rise within 2–4 weeks. Mood effects: 4–8 weeks. Bone density benefits: 6–12 months of consistent use.

Magnesium (required for D activation). Calcium from food sources. Weight-bearing exercise (synergistic for bone).

EPA resolves inflammation via specialised pro-resolving mediators (SPMs). DHA is a structural component of brain cell membranes and retinal tissue. Together they modulate inflammatory pathways (NF-κB), support cell membrane fluidity, reduce triglycerides, and protect cardiovascular function — all areas of increasing vulnerability during estrogen decline.

●●●●● Strong
Cardiovascular and anti-inflammatory benefits are rock solid. Hot flash reduction evidence is moderate — some RCTs positive, some null. Mood benefits strongest at EPA-dominant ratios (2:1 or higher EPA:DHA).

Anti-inflammatory effects: 2–4 weeks. Mood: 4–8 weeks. Cardiovascular markers: 8–12 weeks. Use a high-quality triglyceride-form supplement.

Modulates cortisol production via the HPA axis. Has GABAergic activity that reduces anxiety. Supports thyroid function (mildly increases T3/T4 — check with provider if on thyroid medication). May improve DHEA-S levels, supporting energy and libido.

●●●●● Strong
Multiple RCTs confirm cortisol reduction, anxiety improvement, and sleep benefits. KSM-66 is the most-studied extract. Specific perimenopause data is emerging and positive.

Anxiety reduction: 2–4 weeks. Sleep improvement: 2–6 weeks. Cortisol and hormonal effects: 8–12 weeks.

Mild GI upset in some. Can be mildly stimulating — if it disrupts sleep, take only in the morning. Avoid if hyperthyroid. Cycle 8 weeks on, 2 weeks off.

Replenishes phosphocreatine stores in both muscle and brain. Provides rapid ATP regeneration under demand — physical and cognitive. As estrogen declines, the brain's glucose metabolism drops; creatine provides an alternative energy substrate. Also supports lean mass retention during the accelerated muscle loss phase.

●●●●● Rock solid (general) · Strong (perimenopause-specific)
Hundreds of RCTs for performance and cognition. Women-specific and perimenopause research is newer but consistently positive. Dr. Stacy Sims is a strong advocate for creatine in midlife women.

Muscle saturation: 3–4 weeks at 5g/day. Cognitive effects build over weeks. No loading phase needed.

Mild water retention (intracellular, not bloating). The "weight gain" concern is a persistent myth — it's lean mass and water, not fat. Kidney concerns in healthy adults are debunked.

Crosses the blood-brain barrier and increases alpha brainwave activity (the "relaxed alertness" state). Boosts GABA, serotonin, and dopamine. Reduces excitatory glutamate. Creates calm without drowsiness.

●●●●● Strong
Well-supported for anxiety and sleep quality. Excellent safety profile. Can be used both routinely and as-needed (see Rescue Protocols).

Effects within 30–60 minutes of a single dose. No build-up required.

Does not act as a phytoestrogen despite common belief. Instead, modulates serotonin receptors involved in thermoregulation. May also have mild anxiolytic effects through GABAergic pathways.

●●●●● Moderate
Multiple RCTs show benefit for vasomotor symptoms. Effect size is moderate — don't expect HRT-level relief. The German Commission E approves it for menopausal symptoms. Use standardised extract (Remifemin is the most-studied brand).

4–8 weeks for full effect. Not fast-acting.

GI upset, headache (uncommon). Rare liver concerns have been reported but causality is debated. Limit use to 6 months, then reassess. Don't use concurrently with HRT without provider guidance.

Hydrolysed collagen peptides are absorbed and accumulate in skin, cartilage, and bone where they stimulate fibroblasts and osteoblasts to produce new collagen. Also provides glycine (sleep-supportive, anti-inflammatory) and proline (wound healing, arterial integrity).

●●●●● Moderate
Skin and joint benefits have decent RCT support. Bone density evidence is emerging. Take with vitamin C for optimal absorption.

Skin: 4–8 weeks. Joints: 8–12 weeks. Bone: 6–12 months.

●●●●● Strong
Choose methylated forms (methylfolate, methylcobalamin, P5P) rather than synthetic folic acid and cyanocobalamin — common MTHFR variants (affecting an estimated 30–50% of the population, depending on variant) impair conversion.

Energy effects: 1–2 weeks. Homocysteine impact: 4–8 weeks.