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The cognitive changes women notice around the mid-30s and into the 40s are not purely age-related in the generic sense. Estrogen begins to fluctuate in the perimenopause transition, which affects the hippocampus and prefrontal cortex directly. Brain glucose metabolism also starts declining during this period. Both of these changes affect the cellular energy available for cognitive processing. Learn what you can do about it. 

NAD+ is a coenzyme found in every cell in the body. It plays a central role in the metabolic pathways that convert nutrients into ATP (cellular energy), serves as a required cofactor for the enzymes that repair DNA damage, and activates sirtuins, a family of proteins that help regulate cellular stress responses and longevity pathways. Without adequate NAD+, cellular energy production and repair processes slow. This is why NAD+ has attracted significant research attention as a target for healthy aging interventions.

Three lifestyle factors have the most consistent research support for cognitive function in women over 35: resistance training, omega-3 fatty acids, and sleep architecture. Each addresses a different mechanism of the brain fog picture, and the evidence behind each has grown substantially in the past five years. None is a quick fix, but each is directly actionable and compounds over time. Supplementation with NAD+ and creatine provides additional cellular energy support that the lifestyle layer does not cover on its own.

Brain fog gets worse in perimenopause because estrogen, which plays a direct role in supporting synaptic density, memory formation, and brain energy metabolism, begins to fluctuate and decline. Estrogen receptors are concentrated in the hippocampus and prefrontal cortex, the brain regions most responsible for memory and executive function. As estrogen becomes less consistent, these regions receive less support, and the cognitive difficulties many women describe, word-finding trouble, slower processing, difficulty sustaining focus, have a documented neurological basis. This is not imagined, and it is not simply aging. Learn more. 

CoQ10 (coenzyme Q10) is a fat-soluble compound that plays a required role in the mitochondrial electron transport chain, the process by which cells produce ATP. Without adequate CoQ10, oxidative phosphorylation cannot proceed efficiently, and cellular energy production declines. The richest whole-food source of CoQ10 is beef heart, which contains approximately 11.3 mg per 100 grams, more than any other food. CoQ10 production in the body also declines with age, which is why whole-food and supplemental sources become increasingly relevant in the 30s and beyond.

Iron exists in food in two forms. Heme iron is bound within hemoglobin and myoglobin in animal tissue, particularly red meat, organ meats, poultry, and seafood. Non-heme iron is found in plant foods, fortified grains, and most iron supplements. Both provide elemental iron, but their absorption mechanisms are fundamentally different. Learn more.