3 Foundational Supplements for Midlife Women to Support Muscle, Bone, and Brain Health

Sims stresses that iron supplementation is not for everyone; it must be guided by blood tests. She warns that over-absorption of iron can mimic deficiency symptoms (flat, tired). The protocol she outlines is specifically for those who need it. She also notes that the standard lab reference ranges have shifted, so women should interpret their ferritin in the context of their activity level, not just the population range. The every-other-day approach is based on the hepcidin response: after a dose of iron, hepcidin rises to limit further absorption, so daily dosing may be less effective.

Sims emphasizes that creatine is not just for muscle performance; it's a systemic supplement. She explains that women tend to eat less meat and thus have lower baseline stores. The brain, heart, and gut all rely on creatine for fast energy. Under fatigue, creatine can improve mood and cognitive function. She recommends a consistent low dose rather than loading, and notes that it takes about 3 weeks to reach full saturation, though benefits may be felt within a week. During travel or heavy training, increasing creatine can mitigate jet lag and support reaction time. She also mentions that the old bodybuilding approach of high-dose loading with carbs is unnecessary for general health.

Sims presents this trio as the non-negotiable foundation. She argues that before considering other supplements, women should ensure they are getting these three. Omega-3s are often underdosed or overlooked; she stresses a 'really good' omega-3 for its anti-inflammatory and cell wall benefits. Vitamin D3 is critical even in sunny climates because of winter depletion. Creatine is the one she really pushes because of its wide-ranging benefits beyond muscle. She then says that depending on individual phenotype (ectomorphic) or activity (running), one might add calcium or iron, but only after testing.

Sims explains that when you get iron tested, you're compared against the whole population, which has gotten sicker over time. So a ferritin level that would have been flagged as low a few years ago is now considered normal. For hybrid athletes or runners, a ferritin of 20 can cause significant fatigue and performance decline. She emphasizes that you need to advocate for yourself and look at your own levels relative to your activity, not just the lab range.

She frames the choice around what the body needs: cellular integrity and anti-inflammatory support. Omega-3 fatty acids boost the body's natural anti-inflammatory processes and maintain cell membrane health. Vitamin D3 is critical for every system, especially muscle and bone, and even in sunny climates, many women are deficient after winter. Creatine, often overlooked by women, supports fast energetics in brain, heart, muscle, and bone. She stresses these three are foundational and then you can add iron or calcium based on individual needs.

She explains that women tend to eat less creatine-containing foods (animal products) and thus have lower stores. Creatine is involved in the phosphocreatine system for fast energy (0-20 seconds) in all tissues. For brain health, it supports mood and cognitive function under fatigue; she cites that 5g twice a day improves mood and function under fatigue states. A consistent low dose (5g/day) boosts tissue stress resilience, which is crucial in today's high-stress environment. She also notes that during travel or heavy training blocks, increasing creatine intake can help with cognition and reaction time.

She explains that hepcidin, the enzyme/hormone that inhibits iron absorption, is lowest first thing in the morning before training. After exercise, inflammation increases hepcidin for hours, reducing absorption. Therefore, taking iron every other day in the morning maximizes absorption. She also advises against taking iron with a vitamin C tablet; instead, pair it with vitamin C-rich foods like kiwi or strawberries. The every-other-day schedule is based on the body's iron absorption regulation, which downregulates after a dose.