ConsumerLab.com uses JavaScript to provide the best possible experience for our content, but your browser has it disabled. Learn how to enable it here.

Search term may appear only in full report available to members. Join now for full access.

CL Answer

What is the difference between cysteine and cystine?

Find out the difference between cysteine and cystine amino acids, including where each is found and their functions.

Young Woman Taking Supplement

News Release

January 23, 2025

ConsumerLab Tests Identify Best Black Currant, Borage, Evening Primrose Flax and Hemp Oils

White Plains, NY, January 23, 2025 —  Black currant, borage, evening primrose, flax, and hemp oils contain omega-3, -6, and/or -9 fatty acids that, when replacing saturated fats in the diet, may help reduce cardiovascular risk.

News Release

November 25, 2013

Many Probiotic Supplements Fall Short on Listed Amounts of Helpful Organisms

White Plains, New York, November 25, 2013 — Probiotic supplements and foods containing "friendly" bacteria or yeast have become popular among people hoping to improve bowel function, immunity, and even mood.

News Release

July 31, 2013

Watch Out for Fake Bilberry Supplements, Cautions ConsumerLab.com

WHITE PLAINS, NEW YORK July 31, 2013 — Extracts of bilberry, a cousin of blueberry, may help improve vision and have other health benefits, but some bilberry supplements may not contain real bilberry extract -- the type used in most clinical studies. ConsumerLab.

News Release

February 09, 2012

Probiotics grow in popularity but don't always deliver on promises says ConsumerLab.com -- New report provides guidance to consumers

White Plains, New York, February 9, 2012 — Probiotic supplements and foods containing "friendly" bacteria or yeast have become popular options for people hoping to improve bowel function or boost immunity. But many customers are confused by the vast array of choices.

News Release

November 16, 2009

ConsumerLab.com finds many probiotics don't deliver listed ingredients

White Plains, New York November 16, 2009 — Many probiotic supplements do not contain the number of viable organisms listed on their labels according to a new report from ConsumerLab.com.

News Release

September 15, 2009

ConsumerLab.com finds many prostate supplements have correct ingredients, but four fail review -- New report on 19 saw palmetto and beta-sitosterol supplements

White Plains, New York — Tuesday, September 15,2009 — ConsumerLab.com announced test results today from its newest Product Review of Prostate Supplements.

News Release

August 04, 2009

Most vitamin E supplements pass testing, but what seems natural may be synthetic according to ConsumerLab.com -- New review of vitamin E supplements, oils, and creams released today

White Plains, New York — November 16, 2009 — Many probiotic supplements do not contain the number of viable organisms listed on their labels according to a new report from ConsumerLab.com.

News Release

December 10, 2007

ConsumerLab.com finds improvement in quality of omega-3 and -6 supplements — Results for 22 products made from evening primrose, flaxseed, borage and black currant oils

WHITE PLAINS, NEW YORK — DECEMBER 10, 2007 — A new report on the quality of omega-3 and -6 fatty acid supplements made from seed oils was released by ConsumerLab.com today. Two products were slightly low in one fatty acid, but this is an improvement over results from ConsumerLab.

News Release

December 12, 2006

Probiotic supplements grow in popularity but viable bacteria missing in many — ConsumerLab.com cautions consumers to select probiotics carefully and store them properly

WHITE PLAINS, NEW YORK — DECEMBER 12, 2006 — Sales of supplements containing beneficial organisms (probiotics) have grown rapidly, but a new test report from ConsumerLab.com shows that 44% contained fewer viable organisms than claimed or generally known to be effective.

News Release

July 12, 2005

ConsumerLab.com finds some supplements lower in omega-3 and omega-6 fatty acids than claimed — Report available for 23 products made from oils of black currant, borage, evening primrose and flax

WHITE PLAINS, NY — July 12, 2005 — ConsumerLab.com has released its latest report on the quality of supplements made from the seed oils of black currant, borage, evening primrose, and flax.

Recalls & Warnings

December 30, 2014

Maker of Aloe, Weight Loss Supplements and More Warned for Manufacturing Violations, Drug Claims

On December 17, 2014, the FDA issued a warning letter to Dandy Day Corporation, following a facility inspection which found the company's products, including Aloe Pearl, Alfalo, Aloespring, Crave Away, Original Supreme Energy, Ener "G," Can G, Flora G, Flora G Plus, and Garolic, to be adulterated ...

Recalls & Warnings

October 11, 2013

Prebiotic and Digestive Enzyme Supplement Recalled Due To Drug Risk

On October 10, 2013, Adeeva Nutritionals Inc. issued a voluntary recall of digestive supplement Flora Essentials due to potential contamination with the prescription antibiotic chloramphenicol.