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B12 injections typically deliver about 1,000 mcg per dose, while oral supplements can range from 50 to 5,000 mcg
The 2025 narrative review noted that despite the volume of preclinical work, well-controlled human trial data are scarce, and the regenerative findings should be interpreted accordingly (PMID 40789979)
Kennedy Jr., who has described himself as a big fan of peptides and vowed to overturn industry restrictions put in place under President Joe Biden due to safety concerns and a lack of data
Common injection sites: For Intramuscular (IM): Upper arm (deltoid) Outer thigh (vastus lateralis) often the easiest self-injection site Upper outer gluteal muscle usually requires assistance For Subcutaneous (SQ): Abdomen (at least 12 inches away from the navel) Outer thigh Back of the upper arm What are the side effects
