This product is top quality and I highly recommend it. Only recently, I became aware of vitamin B12 deficiency being greatly underdiagnosed, and since I started experiencing intermittent skin numbness on my legs and feet over the past year, and have been on long term stomach acid medicine that can result in B12 and Mg deficiency, I thought I'd give it a shot. Well, after just four days at three pills a day, my symptoms have vanished. I recently had a flu, and stopped taking my vitamins for about three days, the numbness came back! This stuff really helped me, it's tasty and very easy to take. Five stars.