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Limiting sugars, refined carbohydrates, saturated fats, and high-fat animal products is recommended, as they may raise TSH and worsen inflammation (Baygut And Beyhan 2024)

PDA is not separately listed no FDA guidance, ruling, or bulks entry mentions "pentadeca arginate." However, PDA meets none of the three criteria required for legal 503A compounding: no USP monograph, not a component of any FDA-approved drug, and not on the Category 1 bulks list

Stephens, F.B., Constantin-Teodosiu, D., and Greenhaff, P.L., New insights concerning the role of carnitine in the regulation of fule metabolism in skeletal muscle, J

its not currently prescribable through legitimate compounding pharmacies