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A synthetic stimulant never tested in humans, 1,3-dimethylbutylamine (DMBA), is identified in multiple dietary supplements.
Here is the conclusion: (Hint, they suggest a recall of all DMAA products):
Our objective was to determine if a stimulant never before sold for human consumption, DMBA, was present in dietary supplements sold by US distributors. We found that at least a dozen supplements sold by US distributors contain DMBA in dosages from 13 to 120 mg per serving. Given the potential health risks of untested pharmacologic stimulants, we strongly recommend that manufactures immediately recall all DMBA containing supplements. The FDA and other regulatory bodies should, without delay, warn consumers about the presence of DMBA in dietary supplements and clarify the legal status of DMBA. Until consumers can be assured that sports, weight loss and mind enhancing supplements do not contain untested pharmaceutical drugs, these products should be avoided.
Read it here: http://onlinelibrary.wiley.com/doi/10.1002/dta.1735/full