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Description
If they hadn't abused it

Severe vitamin B12 deficiency affects about 3 percent of adults in developed countries, but a more marginal deficiency may impact 26 percent, with the highest rates among adults older than 60
Treating vitamin B 12 deficiency Treatment for this condition involves replacing the missing vitamin B 12

Usage And Safety

(2003) Insulin resistance in the liver-specific IGF-1 gene-deleted mouse is abrogated by deletion of the acid-labile subunit of the IGF-binding protein-3 complex: relative roles of growth hormone and IGF-1 in insulin resistance

While theres a lot of hype regarding B12 and mixed-ingredient lipotropic injections, these arent even a guarantee for everyone, nor are they completely risk-free