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Most commercial products target the 0.5 to 1 percent range
If you don't have a deficiency, you probably won't notice any benefits from a B12 shot, especially since any excess is simply excreted through urine
As for my injection site of choice, I chose the upper buttocks (gluteus medius) mainly because of the size of the muscle and the relative ease I have accessing it
The enzyme NNMT normally changes nicotinamide, a form of vitamin B3, by using methyl groups, which lowers nicotinamide adenine dinucleotide (NAD+) levels
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