"Just started taking this brand. Previously used product from a well known mail order outfit. The other product had 2500 IU per softgel with cholecalciferol. It also has vitamin K, zinc and magnesium, plus some trace amounts of L-taurine, Quercetin and Boron. The Nature's Bounty brand only has the D3 and no other supplements. I am not sure if that affects the absorption of the D3 or not. I do like that I only need to take 1 soft gel instead of 2 in order to get the 5000 IU dosage."