@EstrogenDragonLover
Memory and learning results are often uniquely varied with each lab subject. A lot of different things can affect memory issues like injury, disease, nutritional deficiency and aging.
For age-related memory enhancements with no other known issues, I personally would start by checking labs on vitamin levels for vitamins D, K, B12, B6, Folate & iron/ferritin. Deficiency in these can significantly speed up age-related cognitive decline, and reduce brain fog, learning, focus, and memory abilities. Research studies show that nearly half of people with aging memory/learning problems are deficient in many of these nutrients. Another supplement that is useful but you cant really test is DHA/EPA (omega 3). Make sure you use a quality supplement brand though or you will be wasting your time and money.
If you dont have nutritional deficiencies or injury/disease related and just want to enhance learning and memory abilities, I would start with prptides that increase BDNF and synaptic plasticity. The ones I have personally found most helpful are Pinealon, Semax (or a Selank/Semax combo was better in my opinion), and NAD+. Dihexa and P21 are also good but nearly impossible to find lately.
If your issues are from aging then you may want to also look into peptides that deal with cell renewal, neuroinflammation and mitochondrial repair. I have found BPC-157, TB500, KPV, SS-31, Epitalon, FOXO4-DRI, and Ipamorelin to be most beneficial for me. Hope this helps.