bpc 157 makes me tired People talk about BPC-157 like it's one thing. It isn't. Oral BPC-157 stays local. It survives digestion long enough to act on the GI mucosa, then clears before it reaches systemic circulation BPC-157: Tendon Repair and More
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Dual growth factor delivery from bilayered, biodegradable hydrogel composites for spatially-guided osteochondral tissue repair

Vitamin B12 also has no established tolerable upper intake level due to its low toxicity, and excess amounts are generally excreted without adverse effects

It may also cause allergic reactions in some individuals

Many long COVID patients already have dysregulated, not simply overactive, immune systems