I just started on this liquid product. Take 4-5 half dropperfuls first thing in the morning on empty stomach. This is about 5000mcg per dose. Very pleasant tasting.

Now Foods, Ultra B-12, 5,��� mcg, 4 fl oz (118 ml) - iHerb.com

I also have Methyl B-12 in lozenge form of 1000mcg also by now foods.

I'm sure I became very low when I was in recent hospital/rehabs for knee issue.