Clinical research and the treatment for cyanide poisoning have shown that even extremely high doses of vitamin B12 and the serum values that go with it are harmless
However, some individuals are more prone to B12 deficiencies due to various factors, such as dietary choices, age, digestive health, and certain medical conditions
I've used up ampoules that are long out of date and have been subjected to fluctuating heat (terrible for wine!) due to being in my car, etc, and haven't noticed any difference
But for patients who have done the foundational work diet, movement, sleep, lab optimization and are still hitting a wall with fat metabolism or body composition, it may be a worthwhile piece of the puzzle
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