Most researchers switch from one to another, not combine them
Injectable peptides after reconstitution typically require refrigeration
M.Aboubakar NanaF.et al (2020)
The most effective are: eggs (rich in tyrosine and choline, which support dopamine and acetylcholine production), oats (slow-release carbohydrates that prevent blood sugar crashes), spinach and cabbage (high in l-glutamine, which reduces craving intensity), bananas (rich in B6 and tryptophan, which support serotonin production), and nuts and seeds (high in magnesium, which supports GABA and reduces anxiety)
The key point is that while it's possible to continue contributing to an HSA after age 65, doing so introduces an extra layer of planning to stay within all of the applicable rules and maximize the HSA's benefits