NANP Board Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer includes the essential amino acids necessary for human health. Essential amino acids are those that the body cannot synthesize on its own, thus they must be obtained through diet. The list provided features Lysine, Tryptophan, Methionine, Valine, Phenylalanine, Leucine, Isoleucine, and Threonine, which are all recognized as essential amino acids.

These amino acids play critical roles in numerous bodily functions, including protein synthesis, hormone production, and immune function. For instance, Lysine is vital for calcium absorption and collagen formation; Tryptophan is a precursor for serotonin, a neurotransmitter that affects mood; and Methionine is important for the metabolism of fats.

The other choices include amino acids or compounds that are either non-essential, meaning the body can produce them, or are not categorized as amino acids typically required in human nutrition. Therefore, the list in the correct answer comprehensively fulfills the criteria for essential amino acids necessary for maintaining health and proper physiological functioning.