I test as low in vitamin B-12 unless I take supplements to keep the levels up in my bloodwork. I take the 1000mg version and it works great to keep my energy levels up. It also helps to metabolize fats etc. These are best priced at Walmart $11.97 for 100 tablets. They also go on sale at Shoppers Drug Mart for about $7.99. Coupons are available online for Nature's Bounty.