can you feel tired after a b12 injection I All the Time. Do I Need Shot?: Shawn Veiseh, M.D.: Family Medicine Vitamin B12 injection - Redwood
Description
Look and feel healthier

Bacteria-derived hydroxocobalamin (OHCbl) and CNCbl are converted in humans to useful coenzyme forms to support metabolic processes such as mitochondrial methyl malonyl coenzyme A mutase conversion of methylmalonic acid (MMA) to succinate to link lipid and carbohydrate metabolism, and activation of methionine synthase, the rate-limiting step in the synthesis of methionine
The answer depends on your individual needs

UK multi-ingredient products Some UK skincare products include AHK-Cu (listed as Copper Tripeptide-3) as one active among many
The B12 dose stays constant