Any form of introduction into the human or animal body is illegal.
If you have certain digestive disorders, including pernicious anemia, or have had gastric bypass surgery, oral B12 will simply not work because you can't absorb it correctly
A clinical study on modified growth hormone releasing factor (CJC-1295) demonstrated sustained increases in GH and IGF-1 levels following repeated dosing with a favorable safety profile, supporting the use of consistent dosing over multi-week protocols
B12 is water-soluble, so it is not stored in fat tissue the way some vitamins are
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Veterinary use has included applications in racing horses, companion animals, and other species