This is because they have trouble absorbing B12 from food
A new vial that looks wrong might indicate a manufacturing or shipping issue
If your protocol requires co-administration of multiple peptides (for example, combining AHK-Cu with GHK-Cu for comparative copper-peptide research), administer them at separate injection sites spaced at least 23 cm apart to minimize local tissue interaction
Many of these placebo-controlled studies have demonstrated that folic acid supplementation improved symptoms in severely depressed patients, elderly depressed and demented patients, and those with major acute depression or schizophrenia, particularly in individuals with RBC folate levels below 453 nmol/L (46)
B12 Shots and Lipotropic Shots: What is the Difference
(2014) Safety and Metabolism of AOD9604, a Novel Nutraceutical Ingredient for Improved Metabolic Health J Endocrinol Metab 4(1-2):114