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Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem

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Vitamin B12 is important for many bodily functions, including red blood cell formation, DNA synthesis, and nervous system function

The main difference from proteins lies in their length and structure: peptides generally have molecular weights below 5000 Da and often lack stable three-dimensional structures, whilst proteins contain more than 100 amino acids, exceed 5000 Da in molecular weight, and fold into complex three-dimensional conformations with multiple functional domains

Reitman typically places 20 to 25 units across five points for this area