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NAD+ supplementation (NAD+, NMN, NR) increases the supply of NAD+ precursors from outside the cell

Important to know

Your body can absorb only so much

it encourages a more efficient metabolic state, helping your cells burn fuel more effectively and function at their peak

A peptide is a chain of amino acids held together by peptide bonds, and those bonds are precisely what digestive enzymes (pepsin, trypsin) are built to cut, with the acidic stomach environment finishing the job so an oral peptide is largely destroyed before it can be absorbed, which is why injection is the default

Blood tests measuring serum B12, methylmalonic acid, and homocysteine levels help assess deficiency