NaturesPlus Magnesium 200 mg uses a Soy Amino Acid Chelate form of magnesium. Amino acid chelates are generally considered to have good to very good bioavailability, as the magnesium is bound to amino acids, which helps with absorption and reduces digestive upset compared to inorganic forms like oxide. This makes it a suitable option for addressing general magnesium deficiency and supporting various bodily functions. While not as specifically targeted as L-Threonate for brain health, it is a solid choice for overall systemic benefits, including muscle function, nerve transmission, and energy production. The presence of soy might be a concern for some individuals with allergies or dietary preferences, but from a bioavailability standpoint, it's a good form.