Cell culture studies using adipocytes have shown that NNMT overexpression promotes lipid accumulation and insulin resistance, while NNMT knockdown or inhibition increases NAD+ levels, activates SIRT1, enhances mitochondrial respiration, promotes expression of thermogenic genes including UCP1, and drives white adipocyte browning toward a beige phenotype
You can find it in animal products like meat, fish, and dairy
In two trials employing 1000 g/day oral vitamin B 12 , there was no clinically relevant difference in vitamin B 12 levels when compared with IM vitamin B 12
While a small portion can be converted into active B12, it may replace the bodys natural stores with inactive B12
For example, while the injection covers B, B, B, B, B, you still need other vitamins (like vitamin C, B folate, B if not supplemented separately, etc.) and minerals (iron, zinc, etc.) from food
The practical takeaway is that formulation quality and delivery method are not minor details, they are part of whether the peptide does anything at all