Which is the best form of magnesium to take - one that contains the most magnesium and is best absorbed?
While different magnesium compounds vary in the amount of magnesium they contain
(for example, just 16.2% of magnesium citrate is actual magnesium -- the rest is citric acid, while 14.1% of magnesium glycinate is magnesium), manufacturers are required to list the amount of actual, or "elemental" magnesium on labels so you can compare the actual amount of magnesium provided by supplements, even if they contain different forms. However, be aware that ConsumerLab.com has found some magnesium supplements in the past which were not labeled properly.
Absorption and even certain side-effects can vary by form, as can cost. You can read more about this in the "What to Consider When Buying
" section of the Magnesium Supplements Review. In addition, we identify products which contain a form of magnesium with good absorption, and which specific product
was the most economical way to get this type of magnesium.
Learn More About Magnesium Supplements:
What is the difference between forms of vitamin K2? >>
What is the benefit of magnesium orotate compared to other forms of magnesium? >>
How can the Recommended Daily Allowance (RDA) for magnesium be higher than the Upper Tolerable Intake Level (UL)? That is, how can an amount which is healthful also put you at risk for harm? >>
Is it true that I should not keep magnesium supplements in a daily pill pack mixed with other supplements and medicines? >>
Help! How do I know how much magnesium I am actually getting from my supplement? The label says it contains 500 mg of magnesium "as magnesium citrate" -- but how much of that is magnesium and how much is citrate? >>
Are there drug interactions with magnesium supplements? >>
This CL Answer initially posted on 1/7/2015.
Last updated 8/4/2017.