I’m 81
I’m wise and offer wisdom and personal experience
Vitamins do actually work well in large doses. I’m D3 and B12 deficient absent what I now take. Minimum daily dosages are a farce and meaningless.
I advise large doses of D3 and C to alleviate and or eliminate colds and respiratory difficulties.
I fairly recently learned about B12. I started taking it and then increased the dosage. A problem with being old is lethargy, blahs, and tiredness. B12 ends those and life is more normal. I’m not 25 but maybe feel like I was 55 or at least 65.
I can not say enough about how the B12 has helped me shed the years.
Regarding dosage........ learn by experience. Go to Walmart and buy the bottle with the largest dosage. That is what is selling and what most are taking. Try for say 3 weeks or a month.
Once you gain some experience then you can do internet research and try to sort out the conflicting claims based on what you actually know.
I am not a pharmacist not Doctor and have never played one on TV
So what is your B12 dose? There are so many options these days. Even a Liposomal Vitamin B12 Spray