Comments on daily B-12 vitamin --> # of mcgs level. Some say if you eat the right foods, you don't need it. I've heard 1000mcg per day for vegans / vegetarians is common. Costco sells 5000mcg capsules!! I recognize some folks with a B-12 shortage need more. Assume a healthy person w/no shortage. Any helpful comments are welcome (snarky are not) I'm here to learn. Thanks!