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The short answer: NAD+ for cellular energy, creatine for lean mass and cognitive function, and a whole-food nutrient foundation. Women aged 25 to 35 are now among the most active health trackers, increasingly aware that the choices made in this decade compound into the next. Research and clinicians now use the term "longevity window" to describe the years before significant hormonal decline as the period when foundational habits have their greatest impact. Here is what the evidence supports for women who want to get ahead of the curve.

NAD+ plays a documented role in skin cell DNA repair, collagen synthesis support, and the cellular energy processes that maintain skin structure and resilience. As NAD+ levels decline with age, the skin's ability to repair oxidative damage and maintain collagen production declines alongside them. Supplementing with a bioavailable NAD+ precursor supports those cellular processes from the inside out, in a way topical products cannot fully replicate. Here is what the research actually shows.

Estrogen and progesterone are not just reproductive hormones. They regulate multiple systems involved in sleep quality, including GABA signaling in the brain, body temperature regulation, circadian rhythm stability, and the stress response. As these hormones fluctuate and decline across perimenopause and menopause, sleep architecture changes in measurable ways. Learn more.

The science is promising, the mechanism is solid, and the clinical picture for humans is still developing. NAD+ is a coenzyme present in every cell that powers the mitochondrial processes driving brain energy, DNA repair, and cellular signaling. As NAD+ levels decline with age, so does the cellular machinery that keeps the brain functioning at its best. Supplementing with a bioavailable NAD+ precursor like nicotinamide riboside (NR) supports those cellular processes, though large-scale human trials specifically targeting cognitive outcomes in healthy women are limited. Here is what the evidence actually shows, without the hype or the excessive hedging.

Estrogen receptors are distributed throughout the brain, including in the hippocampus and prefrontal cortex, the regions most involved in memory, learning, and executive function. As estrogen declines during perimenopause and menopause, those protective effects shift, and many women experience brain fog, word-finding difficulty, and reduced mental sharpness that are not imaginary and not unrelated to their hormonal transition. Here is what the research says, and what proactive support looks like.

Emerging research suggests it might. The short version: creatine's core benefits for muscle energy, recovery, and cognitive support appear consistent across cycle phases, but the hormonal shifts of the menstrual cycle, particularly changes in estrogen and progesterone, do influence how women store and use creatine. Understanding this can help you set accurate expectations and make the most of supplementation.