Product Tests Select a Review CL Answers  Warnings  Encyclopedia Where to Buy News
Clinical Updates:

CBD and Hemp Oils Reviewed by

I am having trouble sleeping. I regularly take a multivitamin, fish oil, magnesium, calcium, vitamins D and K, and a protein supplement. I also take a low-dose blood pressure medication. Could any of these supplements be causing my insomnia? View Answer >>

Rhodiola and ashwagandha are both promoted to help with stress and anxiety. Is it safe to take them at the same time? View Answer >>

Most Popular Reviews
Other Recent Reviews

Choose the Best CoQ10 & Ubiquinol -- and Save Money - CoQ10 and Ubiquinol Differ in Quality, Absorption & Cost

31% of Turmeric/Curcumin Products Fail CL's Tests - How to Choose the Best Turmeric & Curcumin

Check the Strength and Purity of Green Tea Supplements, Teas, and Drinks - What's Really In Green Tea? (Including Matcha!)

Best and Worst Quality Magnesium Supplements Identified - Avoid Magnesium Supplements With Problems

Best Fish Oil? See Our New Tests and Comparisons - How to Get the Right Omega-3s from Fish, Krill & Other Oil Supplements

28% of Protein Powders Flunk Quality Tests - Popular Protein Powders, Shakes and Drinks Reviewed

Best and Worst B Vitamins Revealed - Many B Vitamin Labels Found To Be Misleading

Surprising Findings for Probiotics and Kefirs - 43 Probiotic Supplements and Kefirs Tested

Find a CL Approved Supplement with Glucosamine, Chondroitin, MSM, or Boswellia - Some Problems Among Supplements for Joint Pain

20% of Vitamin C Supplements Fail Testing - Learn How To Choose and Best Use Vitamin C

Is Your Dark Chocolate or Cocoa Healthful or Toxic? - Is Your Dark Chocolate or Cocoa Healthful or Toxic?

The Best Melatonin Supplements and How to Use Them - See Our Product Tests and Expert Tips

Find Out Which Calcium Rated Best and If You Need It - Check the Quality of Calcium Supplements

Most Garcinia (HCA) Supplements Fail CL's Tests - Garcinia Weight Loss Supplements Found Lacking

Find the Best Lipoic Acid Supplement at the Right Price - Alpha-Lipoic Supplements Found to Range 1,000% in Cost!

Lutein, Zeaxanthin and Vision Formulas Vary Widely - Which Vision Supplement Is Right for You?

Resveratrol: Worth Taking? Best Supplements? - 19 Resveratrol Supplements Reviewed



Find out the right amount of a vitamin or mineral to get each day.

Ginkgo Biloba Supplements
Bone Broths
Green Tea (Bagged, Loose, Matcha, Supplements, and Drinks)
Ashwagandha Supplements
L-Tryptophan and 5-HTP
Valerian Supplements
... and More!

In addition to our product reviews our encyclopedia covers the following:

Herbs & Supplements


Drug Interactions

Alternative Therapies

Join |  Sign In
Product Tests
Brands Tested
Health Conditions
CL Answers
Clinical Updates
Recalls & Warnings
Where to Buy Products
Raw Materials Tests
Testing Program
Join CL Today
Join Free Newsletter
Group Subscriptions
Gift Membership
About Us
The CL Seal
CL Survey
Privacy Policy
Contact Us/Help

©2018, LLC. All rights reserved. A single copy of a report may be printed for personal use by the subscriber. It is otherwise unlawful to print, download, store or distribute content from this site without permission. name and flask logo are both registered trademarks of, LLC. This site is intended for informational purposes only and not to provide medical advice.