"Last week, the University of Guelph published findings of their study on different varieties of melatonin. The university tested 30 different melatonin supplements from 16 brand names. The supplements were sold in grocery stores and drug stores. Of the products tested, 71 percent did not meet their label claims."
Some examples of those inaccuracies as described in the article are listed below:
- 12-25 percent had higher than listed melatonin amounts
- Some products contained almost 5 times the listed amount of melatonin
- One chewable tablet that listed 1.5 mg of melatonin actually contained over 8 mg of melatonin
- Some products skewed the other way, containing less melatonin than listed
- One product listed 3 mg melatonin but contained 83 percent less
- One quarter of the supplements also contained serotonin, which is not authorized to be sold as a supplement, as it could be dangerous for those on SSRI’s
In respect to these findings Dahl states in his article "Sadly, findings such as these are not new, and confirm yet again what we have said all along. Raw material quality matters and manufacturing should be performed responsibly"
Dahl then goes on to in the article to note the various grades of melatonin that are on the market and explains in detail the differences in grade classification. He then talks about the differences in the manufacturing process between small and large batch production runs and how that effects the final product
He finally ends the article by noting the differences between natural and synthetic melatonin and between standard and pharmaceutical grade melatonin
Read the Article Guelph Melatonin Study Examining The Vast Differences By Eldon Dahl/