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Most supplement research was built on male subjects. The gap is not a conspiracy — it reflects decades of research methodology that defaulted to male bodies as the standard. But the practical consequence is real: women metabolize, absorb, and respond to certain key nutrients differently than men, and those differences have direct implications for which supplements matter most and why. Three are worth understanding in detail: creatine, iron, and ashwagandha.† Learn more. 

Memory lapses, word-finding difficulty, and reduced processing speed often appear years before the hot flashes and night sweats most people associate with perimenopause. This is not early-onset dementia and it is not anxiety. It is the direct result of estrogen receptor signaling shifting in the hippocampus and prefrontal cortex — the brain regions most responsible for memory encoding and executive function. The cognitive piece of perimenopause arrives first because those brain regions are among the densest in estrogen receptors, and they feel estrogen's variability before the rest of the body does.†

The cognitive shift many women notice in their mid-to-late 30s is real, measurable, and not a sign that something is wrong. Estrogen modulates dopamine and serotonin activity in the prefrontal cortex, the brain region responsible for working memory, sustained attention, and decision-making. As estrogen becomes more variable during the early perimenopausal window - which can begin years before noticeable physical symptoms - the cognitive functions that depend on stable dopaminergic signaling are the first to shift. This is not a motivation problem. It is a cellular nutrition conversation.†

NAD+ is a coenzyme present in every living cell. It is required for cellular energy production, DNA repair, and the signaling processes that regulate how cells age. Levels decline with age - measurably so in women from the mid-30s onward - and that decline affects everything from physical energy to cognitive clarity. NAD+ supplementation, specifically through the precursor nicotinamide riboside (NR), is one of the most studied approaches to supporting cellular NAD+ levels in aging adults.†

The brain accounts for roughly 20 percent of your body's total energy demand, and it relies on the same phosphocreatine-ATP system your muscles use to power high-demand activity. When creatine stores are low, the brain's ability to rapidly regenerate ATP during cognitively demanding periods is compromised. Research has found that creatine supplementation shows significant positive effects on memory, with subgroup analyses specifically finding greater benefit in females than males.†

Women start with 70 to 80 percent lower creatine stores than men, consume less dietary creatine on average, and experience more life stages - the menstrual cycle, pregnancy, postpartum, and perimenopause - during which creatine demand spikes. The research is clear: women may benefit from creatine supplementation proportionally more than men, yet almost all creatine marketing has been built around male subjects. Learn more about what this means for you.