In this Review, CL tested stimulant blends (which are some of the most popular weight loss supplements and contain caffeine and/or synephrine), as well as supplements with 7-keto DHEA or forskolin (from Coleus forskohlii
). CL has separately reviewed many other types of supplements used for weight loss (See our reports on other supplements used for weight loss: Chromium
, Garcinia cambogia
, Green Coffee Bean
, and Green Tea
, as well as information about Raspberry Ketone
). There isn't overwhelming evidence that any dietary supplement enables significant, long-term weight loss. However, many small studies — typically funded by supplement companies -- suggest short-term weight loss, slimming (reducing fat but not overall weight), and/or appetite reduction (see What It Does
for a summary of the evidence).
What did we find? Laboratory tests and analyses by ConsumerLab revealed potentially dangerous amounts of caffeine in three products and a potentially dangerous amount of synephrine in another — twice the amount expected from its label. In addition, one Forskohlii supplement contained less than 5% of its expected forskolin. All of the 7-keto DHEA supplements contained their claimed amounts. Across products, the dose of caffeine ranged from 51.6 mg to 270 mg per serving in stimulant blends, 7-keto DHEA ranged from 25 mg to 100 mg, and forskolin ranged from just 1.9 mg to 50 mg. The cost to obtain 100 mg of 7-keto DHEA ranged from 15 cents to $3.00 and the cost for 25 mg of forskolin ranged from 33 cents to $1.40 -- showing huge opportunity for savings when buying these products. For details, see What CL Found
Among products Approved in testing, ConsumerLab selected a Top Pick for 7-Keto DHEA
and a Top Pick for Forskolin
, with each providing the clinically tested dosage at relatively low cost. A Top Pick Stimulant Blend
was also chosen that provided a safe level of caffeine.
You must be a member
to get the full test results for weight loss supplements along with ConsumerLab.com recommendations, comments, and quality ratings. You will get results for thirteen supplements selected by ConsumerLab.com for testing and for one other that passed voluntary Quality Certification Testing.
In this comprehensive review, you'll discover: