I was taking 20 mg manganese chelated per day. On 8th July I started taking 10 mg manganese chelated + 1 teaspoon WaterOz manganese ionic. I immediately felt a difference : the WaterOz is definitely much stronger/more efficient. A few days after the change I can report that when taking a teaspoon of ionic manganese I see absolutely no yellow in my pee after taking B2. Same happens to my husband. This must mean that B2 is more easily absorbed/efficiently used with ionic Manganese. There is a definite diffrence in absorption between the two, but it also is a different type of Manganese. Chelated is Mn+2 Ionic is Mn +3, I recall, but my chemistry days are far away. Maybe I am wrong?