While the spread wont be harmful, avoiding it will give you better, more concentrated results with better longevity
Subcutaneous may offer slightly more consistent plasma levels, but the practical difference is marginal given the compounds short half-life requiring daily dosing either way
Always consider consulting a healthcare provider before starting or continuing BPC 157 usage 2 5
1 2 3 Clinical Pharmacology
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25 Castelli MC, Friedman K, Sherry J et al (2011) Comparing the efficacy and tolerability of a new daily oral vitamin B12 formulation and intermittent intramuscular vitamin B12 in normalizing low cobalamin levels: a randomized, open-label, parallel-group study