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A serum B12 level test and, ideally, a methylmalonic acid (MMA) test should precede any B12 injection recommendation
This is especially true for a peptide that modulates the GH/IGF-1 axis
Brigelius-Flohe R, Aumann K-D, Blcker H, Gross G, Kiess M, Klppel KD et al (1994) Phospholipid-hydroperoxide glutathione peroxidase
Long-term abuse, especially by injections, might, however, damage organs or produce pigmentation problems that need medical attention
PMC 4340604
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