I originally bought this to cure my eye floaties, which requires pineapple bromain, and came to find out it is high in Vitamin D3, which it turns out is now more than just a bone strengthener, it has a function with cellular energy production where, if you have the D3 in your system, you get a 16x energy efficiency through your whole energy production. without it, you will feel run down all the time. this has 250% of the D3, so its awesome. it also has vit c, and vit A, all the regenerative vitamins. it also has a lovely tea smell to make it easy to swallow. a fabulous product i will use in place of straight vit c and D3 and Vit A as it comes with half a dozen other rare items, too. i was not paid to review this product, i just really like it so am giving them their just dues.