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Watch for persistent, spreading redness that doesn't subside

Vitamin B12 injections can go into your muscle, under your skin, or through a vein
The process is facilitated by the presence of Polyethylene Glycol, a molecular crowding agent which brings -synuclein molecules in close proximity by displacing water from the immediate vicinity for enhanced hydrogen bonding, non-covalent interactions and hydrophobic interactions (De Luca et al., 2025)

I am 43, female, healthy and active of a normal weight
