These include how bad your deficiency is, how you react to treatment, and the method of injection
If youre self-monitoring or taking other supplements, always be upfront about everything youre using so your overall intake stays balanced

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Other practices that have been documented include the use of depleted milk thistle extracts, which are cheap and are of poor quality, so this is clearly an example of economically-motivated adulteration
A user who injects 500 mg of BPC-157 instead of 500 mcg has taken a dose 1,000 times higher than intended