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b12 tablets versus injections Sublingual vs. B12 Injections: Which Option Is Right for You? – WhyNotNatural 9 Best Vitamin B12 Supplements
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Ironically, after the colonoscopy, I thought I had a stomach acidity problem

If this occurs after you take vitamin B12, call 911 or your local emergency services immediately

It's important to note that these side effects are uncommon, and most people tolerate B12 Methylcobalamin Injections well
The mechanism is purely metabolic: increased energy expenditure , suppressed lipogenesis, and elevated NAD+ levels that activate sirtuins (SIRT1, SIRT3), the same longevity-associated enzymes targeted by caloric restriction

Your food choices also speed this change