This is a reply to the hidden comment.

I've been vegan since 2002 and haven't taken B12 supplements regularly for at least 10 years. My doctor wanted me to get my level checked since I'm vegan and not taking supplements. I'm in the healthy range.

Found out I was overdosing Vitamin D. Aches and pains everywhere and constantly urinating, because too much calcium in the blood.

"Overdosing D is virtually impossible", they say and sell 100 µg capsules in supermarkets.

Recommendation is however 10 µg and even that is seasonal.