Companies get around this by labeling it as a "research chemical not for human consumption." This means the product is completely unregulated, and you have no way of knowing if it's pure, sterile, or even contains the correct substance
Community protocols most commonly describe an 8-12 week injectable course (100-200 mg SC 2-3x/week), with oral NMN (500 mg daily) as a bridge during off periods before repeating
Cumulative thermal exposure matters more than single-event duration
Safety: Although generally considered safe, some side effects have been reported
But injectable peptides are very different
Anyone can be affected, but some groups are more at risk: Vegetarians and vegans, since B12 mainly comes from animal products Older adults, as absorption gets harder with age People with digestive issues like Crohns or coeliac disease Those taking certain medications, such as long-term metformin or stomach acid reducers People with pernicious anaemia, an autoimmune condition that stops you from absorbing B12 If you fit into one of these categories and notice symptoms, its worth getting your levels checked
