I have been using DMAE tabs from another vendor with good results. Since I prefer caps, I thought I would try these. When I received them, I found the Nutrition label to be confusing. It said "DMAE 100 mg" but then right below it read: "2-dimethylaminoethanol bitartrate." The confusion arises from the fact that the label was not clear as to whether each cap contained 100 mg of DMAE bitartrate or considerably more DMAE bitartrate (~300 mg) to provide the 100 mg of actual DMAE. This is important, because 100 mg of the DMAE bitartrate provides only 37 mg of pure DMAE! I contacted Bluebonnet and they were very helpful and confirmed that the capsules do indeed contain 300 mg of the bitartrate. They also indicated that they would consider changing their label to conform with other manufacturers who state on their labels "xxx mg of DMAE derived from yyy mg of..." which is totally non-ambiguous." It's the words "from" or "derived from" that are important so the user knows they are getting the quantity of actual DMAE they are expecting. Pure DMAE itself is a liquid, so it must be combined with another substance (tartaric acid) to convert it to a solid for tablets or caps.