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2 Materials and methods A comprehensive narrative review was conducted through systematic searches of PubMed, Scopus, and regulatory databases (FDA, WADA) from inception through January 2026

Look for brands with positive reviews and clear information about their product sourcing and testing to avoid contaminated or improperly synthesized products that can cause adverse reactions

This method is particularly beneficial for those who have trouble absorbing vitamins due to dietary restrictions or certain medical conditions

Those Focused on Metabolic Health or Weight Management Specific amino acids play important roles in fat metabolism, insulin sensitivity and muscle preservation