We all must also be very careful if we take large doses of vitamin D3 it strips magnesium out of your body I learn the hard way and had no idea.. I was taking more than 50,000 IU per week sometimes 100, which may be fine if you are also supplementing magnesium. But with the poor soil quality our fruits and vegetables barely have any amount of magnesium ..I got multiple MRIs all kinds of blood tests spent tens of thousands of dollars.. I was dizzy with blurry vision , and tinnitus starting mid-January of this year, 2021, and finally figured out the problem 3 weeks ago when I started taking this high quality chelated magnesium. .. I basically had these symptoms 24/7 for about 9 months and after taking this magnesium (3 pills) at bed within 48 hours I was completely fine. Bottom line mostly everyone should be supplementing with magnesiun . Chelated seems to be the best. Especially if you're taking large doses of vitamin D3 you definitely need magnesium taken with it