This seems like sound general advice, although, lately I'm not very impressed with FDA standards. This is the same group that has approved flavored e-cigarettes with propylene glycol, BPA-coated (and later BPS-coated) food containers and teflon-coated cookware, carrageenan in meats, hydrogenated fats in oils and food products, baby food with rice flour / arsenic, noodles with plastics and msg, etc... I mean, is *this* the organization that we would want to approve our dietary choices? Their regulatory pipeline includes passing grades for products like Cheetos and Slim Jims, approving foods like
these to be sold as "Smart Choices."
Comparing track records, I would much rather trust a company like Thorne Research than the FDA in this area. The same lack of "universal standards" applies to food, which is consumed in much higher quantities -- what's on my conventionally-grown celery and strawberries? How much mercury is in my tuna? When I purchase supplements, there's at least a CoA available upon request, which is more than can be said for say, turmeric root --
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5415259/ "The FDA has published several recommended maximum levels of lead; however, the FDA has not established guidelines for lead levels in spices."
If we're looking to assess the risks and benefits for particular compounds, do we just ignore the majority of research on peer-reviewed scientific journal articles? Looking at the benefits of supplemental magnesium for instance, would it be in our best interest to try to get more magnesium from eating a ton of wheat bran instead, which is among the richest food sources of magnesium? Or, if we want to increase our B-vitamin consumption, would we then want to increase our consumption of red meat, rich in b-vitamins? Or, if we want more polyphenols and resveratrol, would we be better off drinking more red wine?
I tend to see supplements as being part of the diet, and a healthy diet is certainly a key factor for disease prevention. Certainly, there's no magic bullet for brain health, but there are statistically significant associations.