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PMC Roles of nicotinamide N-methyltransferase in obesity and type 2 diabetes
Intramuscular B12 injections bypass the digestive tract entirely, ensuring full bioavailability where oral supplementation may be insufficient or ineffective
Always use clean, sterile needles and syringes
For example, you can order a genetic saliva test kit from 23andme.com , or see if you can get a genetic test from your physician, which may be covered by insurance
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