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I think you should report the bleeding to your GP
Certain medications, including some medications used to treat gastrointestinal disorders, may make it more difficult for some people to absorb B12 from food sources
Wherever you buy, the online-specific checks are the same: confirm a batch-matched COA, a verifiable US business address, secure credit card payment rather than crypto-only, and clear For Research Use Only labeling
Injecting or infusing NAD+ directly is different from taking a precursor like NR or NMN, and the pharmacokinetics of a large NAD+ dose are still debated
But the symptoms you're attributing to high B12 are real, and they're worth investigating
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