I鈥檝e bought multiple bottles of Can-Prev Magnesium Bisglycinate from various sources. I鈥檒l trust that it gave me the level of magnesium I needed without any side effects. However, with the liquid bottles it consistently ends up 鈥渃lumping鈥 at the bottle. Clumping into hard non-dissolvable chunks. You would need a hammer to break them up. So, a percentage of the contents gets wasted. I finally clued in and switched to the Can-Prev Magnesium Bisglycinate capsules. No waste. I鈥檇 recommend just purchasing the capsules instead.