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.

Reviews & Articles

Membership & Subscription

About ConsumerLab.com

About Testing

News

Showing Results for Doctor's Best

CL Answers (10)

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

What are the health benefits of serrapeptase?

Serrapeptase is a proteolytic enzyme. Learn more about its health effects, including whether evidence supports its use for pain, inflammation, and heart health.

Serrapeptase for Inflammation and Pain

Do any supplements help prevent or improve cataracts?

Find out which supplements may help with cataracts, including selenium and vitamins A, B1, B3, C, and E.

Doctor Shining Light for Patient Eye Exam

What is EpiCor? Does it really "boost" the immune system and prevent colds?

EpiCor supplement info, including evidence from clinical studies on immune function and cold/flu prevention, safety, and price.

Woman with Cold Holding Pill Bottle

How do I choose the best magnesium supplement?

Choosing the best form of magnesium supplements can be tricky due to the many different types (magnesium aspartate, bicarbonate, carbonate, chloride, citrate and others).

Choosing the Best Magnesium Supplement -- Magnesium capsules, powders and liquids

Is it safe to take curcumin or turmeric supplements for a long period of time?

Information on the long-term effects of curcumin or turmeric supplements. Find out if curcumin and turmeric is safe to take for long periods. ConsumerLab explores these questions.

Is It Safe to Take Turmeric or Curcumin Supplements Long-Term? -- Bottle of Turmeric Capsules

How do I choose the best CoQ10 supplement?

Looking to choose the best CoQ10 brand supplement? Understand which CoQ10 you are buying, differences in dose, absorption, quality and more. ConsumerLab explores this topic.

CoQ10

Which supplements can help with arthritis?

Learn more about collagen supplements for joint health, including evidence from clinical studies on arthritis and muscle strength and safety.

Supplements for Osteoarthritis and Rheumatoid Arthritis -- Women With Arthritic Hands

Do any supplements help prevent or treat osteoporosis?

If you have osteoporosis, you may be interested in supplements for bone health. Find out which supplements can increase bone strength and density.

Supplements and Osteoporosis

Do any supplements help for flu?

Which supplements may help prevent or reduce symptoms of colds or the flu, including vitamin D, ginseng, NAC, and elderberry.

Supplements for Flu -- women with the flu sitting on couch with tissues, thermometer, warm drink

I take levothyroxine (Synthroid), a thyroid hormone to treat hypothyroidism. Are there supplements I should avoid, or be taking, due to this drug?

Is taking certain supplements and hypothyroidism medications bad? Learn which supplements can interact with thyroid hormone medications like levothyroxine (Synthroid), thyroid hormone levels, and laboratory tests.

Levothyroxine (Synthroid) Supplement Interactions
Load More…

Clinical Updates (1)

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

3/31/2022

Doctor's Best Settlement & Refund
Doctor's Best is providing a partial refund to customers of its glucosamine supplements as part of a legal settlement. For details, see the Update to our Joint Supplements Review.

Recalls & Warnings (2)

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

9/08/2020

Holistic Healthy Pet Warned for Drug Claims
6/25/2014

Red Yeast Rice Product Recalled

News Releases (55)

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

2/25/2022

Top-rated Vitamin and Supplement Brands and Merchants for 2022 Based on Consumer Satisfaction
9/11/2021

Best CoQ10 and Ubiquinol Supplements Identified in Testing by ConsumerLab
8/27/2021

ConsumerLab Tests Reveal Best Joint Health Supplements for People and Pets
7/23/2021

Best Astaxanthin Supplements Identified In Testing by ConsumerLab
2/25/2021

Top-rated Vitamin and Supplement Brands and Merchants for 2021 Based on Consumer Satisfaction -- Results of the ConsumerLab.com Survey of Vitamin & Supplement Users
2/25/2020

Top-rated Vitamin and Supplement Brands and Merchants for 2020 Based on Consumer Satisfaction -- Results of the ConsumerLab.com Survey of Vitamin & Supplement Users
10/22/2019

Best Vision Supplements Identified by ConsumerLab
9/27/2019

Best Turmeric and Curcumin Supplements and Spices Identified by ConsumerLab
5/15/2019

ConsumerLab Tests Reveal Big Differences in Digestive Enzyme Supplements
3/11/2019

Best NAC (N-acetyl cysteine) Supplements Identified by ConsumerLab
2/25/2019

Top-rated Vitamin and Supplement Brands and Merchants for 2019 Based on Consumer Satisfaction -- Results of the ConsumerLab.com Survey of Vitamin & Supplement Users
10/02/2018

Best Joint Health Supplements Identified -- ConsumerLab Tests Glucosamine, Chondroitin, MSM and Boswellia Supplements for People and Pets
7/31/2018

Best L-Tryptophan and 5-HTP Supplements Identified by ConsumerLab -- ConsumerLab Tests Strength and Purity of Supplements for Sleep and Mood
3/07/2018

Finding Real Ginkgo Isn't Easy, ConsumerLab's Tests Reveal
2/25/2018

Top-rated Vitamin and Supplement Brands and Merchants for 2018 Based on Consumer Satisfaction
6/21/2017

Which Magnesium Is Best? ConsumerLab.com Tests Popular Brands and Reveals Its Top Pick
6/01/2017

Best Vitamin K Supplement? ConsumerLab.com Tests Popular Products and Reveals Its Top Picks
5/17/2017

Best Vitamin D? ConsumerLab.com Tests Popular Vitamin D Supplements and Reveals Its Top Picks
4/04/2017

ConsumerLab.com Reveals Best and Worst Turmeric and Curcumin Supplements & Spices -- 31% Fail ConsumerLab.com Tests of Quality
2/25/2017

Top-rated Vitamin and Supplement Brands and Merchants for 2017 Based on Consumer Satisfaction
2/23/2017

ConsumerLab.com Reveals Best and Worst B Vitamin Supplements and Why Current Labels Often Mislead
12/21/2016

Best CoQ10? ConsumerLab.com Tests Popular CoQ10 and Ubiquinol Supplements and Reveals Its Top Picks
10/11/2016

What Are the Benefits of Resveratrol and Which Brands Are Best? -- ConsumerLab.com Reviews the Evidence and Tests the Quality of Popular Resveratrol Supplements
9/13/2016

Best Fish Oil? ConsumerLab.com Tests 44 Popular Omega-3 Supplements and Identifies Its Top Picks
7/05/2016

80% of Milk Thistle Supplements Fail ConsumerLab.com Tests of Quality -- Most Found to Be Low in Key Component
6/03/2016

What Works for Joint Health? ConsumerLab.com Reviews Glucosamine, Chondroitin, MSM and Boswellia Supplements for People and Pets
2/25/2016

Top-rated Vitamin and Supplement Brands and Merchants for 2016 Based on Consumer Satisfaction
1/19/2016

SAM-e Supplements Providing Best Quality and Value Identified by ConsumerLab.com
1/05/2016

Cinnamon Spices and Supplements Found to Vary Widely in Levels of Potentially Helpful and Harmful Compounds Reports ConsumerLab.com
6/10/2015

ConsumerLab.com Tests Reveal Best and Worst Magnesium Supplements
5/05/2015

ConsumerLab.com's Tests of Digestive Enzyme Supplements Reveal What Labels Don't
3/17/2015

CoQ10 & Ubiquinol Supplements Vary in Quality, as Well as Dose, Absorption, and Price According to ConsumerLab.com
2/25/2015

Top-rated Vitamin and Supplement Brands and Merchants for 2015 Based on Consumer Satisfaction -- Results of the ConsumerLab.com Survey of Vitamin & Supplement Users
8/20/2014

Some Red Yeast Rice Supplements Up to 500X Stronger Than Others -- Popular Cholesterol-Lowering Supplements Tested and Compared
2/26/2014

Mislabeling of Some Joint Health Supplements with Glucosamine, Chondroitin, Boswellia, and MSM According to ConsumerLab.com -- 38 Supplements Tested, Including Products for Dogs and Cats --
2/12/2014

Top-rated Vitamin and Supplement Brands and Merchants for 2014 Based on Consumer Satisfaction -- Results of the ConsumerLab.com Survey of Vitamin & Supplement Users
12/16/2013

What's Really in Turmeric Supplements and Spices? You May Not Want to Know -- 33% of Turmeric/Curcumin Supplements Fail ConsumerLab.com's Review; Filth Found in Spices
3/05/2013

CoQ10 & Ubiquinol Supplements Should Be Chosen Carefully, Cautions ConsumerLab.com -- Less Than 4% of Listed Ingredient Found in Widely-Sold Product
2/01/2013

Top-rated Vitamin and Supplement Brands and Merchants for 2013 Based on Consumer Satisfaction
8/22/2012

Contamination and Other Problems Found in Fish Oil Supplements -- Large Review by ConsumerLab.com Reveals Excessive PCBs or Mislabeling in Over 30% of Omega-3 Supplements
5/08/2012

Lead Contamination and Mislabeling in Joint Health Supplements with Glucosamine, Chondroitin, and MSM According to ConsumerLab.com
4/26/2012

ConsumerLab.com reviews prostate supplements with saw palmetto and/or beta-sitosterol and finds few likely to be effective
2/01/2012

Top-rated vitamin and supplement brands and merchants on consumer satisfaction for 2012 -- Based on ConsumerLab.com Survey of Vitamin & Supplement Users
10/13/2011

30% of SAM-e supplements selected for review fail to pass ConsumerLab.com testing -- Cost of SAM-e found to vary 5-fold
5/23/2011

Red yeast rice supplements weaker now than in 2008; Wide variation among brands and contamination discovered by ConsumerLab.com -- Popular cholesterol-lowering supplements tested and compared
2/16/2011

Some turmeric and curcumin supplements fail quality review -- ConsumerLab.com finds 20% of turmeric supplements selected for review deliver less than 15% of promised compounds
2/01/2011

Top-rated vitamin and supplement brands and merchants on consumer satisfaction for 2011 -- Based on ConsumerLab.com survey of vitamin and supplement users 
1/31/2011

Vitamin D use increased 52% in past two years according to ConsumerLab.com survey of supplement users -- Fish oil continued to surpass multivitamins as most popular supplement and Internet was most common place to buy supplements
10/07/2009

ConsumerLab.com finds that only two-thirds of alpha-lipoic acid supplements selected for testing pass quality review -- Anti-oxidant supplements helpful to diabetics
5/19/2009

Review of Magnesium Supplements by ConsumerLab.com Shows One-Quarter Fail Quality Tests
1/13/2009

ConsumerLab.com reports largest test of CoQ10 and ubiquinol supplements -- Most supplements provide claimed ingredient, but large variation in dosage and forms may confuse consumers.  ConsumerLab.com provides guidance.
10/30/2007

Recently tested magnesium supplements free of lead, but one product missing most of its ingredient according to ConsumerLab.com — First Major Product Review of Potential "Life-Extending" Ingredient
4/11/2007

Many arthritis supplements lack key listed ingredient — ConsumerLab.com finds chondroitin missing or low in eight supplements; Glucosamine and MSM also tested
10/20/2006

ConsumerLab.com report on CoQ10 supplements finds quality high but large range in suggested dosage
3/13/2006

ConsumerLab.com reports on supplements for bone health containing calcium and vitamin D— Results posted for 32 supplements for adults and children; One found contaminated with lead
Load More…
Results
  1. Product Reviews
  2. CL Answers
  3. Clinical Updates
  4. Recalls & Warnings
  5. News Releases