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But since they can inhabit the guts of animals, us humans can get our B12 intake from meat

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This randomized, placebo-controlled, double-blind study in healthy adults (ages 21-61) demonstrated that subcutaneous administration of CJC-1295 (DAC) led to sustained, dose-dependent increases in mean plasma GH concentrations (2- to 10-fold for 6 days or more) and IGF-I concentrations (1.5- to 3-fold for 9-11 days)

As mentioned, heavy metal exposure can happen almost anywhere, but these sources are the main culprits: Naturally, some foods contain higher amounts of heavy metals than others

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