The most important thing to realize is that blood tests for B12 are highly inaccurate at detecting actual cellular levels of B12 (meaning the B12 thats available for the cells to use)

Water, Centella Asiatica Extract (12.3%), Glycerin, Cetyl Ethylhexanoate, Cetearyl Alcohol, Glyceryl Stearate, Glutathione (1,000ppm), Niacinamide (1,000ppm), Madecassic Acid, Asiaticoside, Asiatic Acid, Solanum Melongena (Eggplant) Fruit Extract, Melaleuca Alternifolia (Tea Tree) Leaf Extract, Hydrolyzed Collagen, Beta-Glucan, Hippophae Rhamnoides Fruit Extract, Nelumbo Nucifera Extract, Artemisia Annua Extract, Oryza Sativa (Rice) Extract, Saccharomyces Ferment, Squalane, Sodium Hyaluronate, Dipropylene Glycol, Butylene Glycol, Hydrogenated Lecithin, Cholesterol, Xanthan Gum, Potassium Hydroxide, Disodium EDTA, Caprylic/Capric Triglyceride, Cyclopentasiloxane, Cyclohexasiloxane, Saccharide Hydrolysate, Sorbitan Stearate, Dimethicone, PEG-100 Stearate, Stearic Acid, 1,2-Hexanediol, Chlorphenesin, Carbomer, Caprylyl Glycol Ingredients subject to change at manufacturer's discretion

Michelle Routhenstein, RD at Entirely Nourished says its because of reduced appetite and slowed digestion: These symptoms lead to lower calorie intake and potential nutrient deficiencies, which can decrease energy levels, she explains
Katzenschlager R, Bergquist F
Laboratories can use these aligned procurement characteristics to standardize how study arms are documented and repeated
It has since become one of the most popular prescription drugs in the United States