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Where is folic acid generally better to buy? Which folic acid is better?

Folic acid is best bought in a drugstore.

There are many brands of folic acid, as long as they are bought in regular pharmacies, they are all better.

Because folic acid is a vitamin. So there is no need to buy expensive health care products, just buy folic acid in the whole pharmacy. Drugs are much more effective than health care products.