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While L-carnitine appears to have few possible side effects

Forty-plus years of foundational literature

In that table, patients were stratified into 8 categories based on the nutraceutical taken (vitamin D, vitamins B, iron, zinc, multivitamins, selenium, omega-3 acids), with data summarized as a percent of patients reporting a benefit for 8 items, the denominator being the said 197 participants

Carnitine is considered a vitamin-like and amino acid-like compound that's related to the B vitamins

Healthcare providers will usually do blood tests to check for B12 deficiency in people who have a high risk of developing it