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CL Answer

Which supplements, foods or diet and lifestyle changes help relieve acid reflux (heartburn), and which worsen it?

Find out which supplements and foods can help relieve acid reflux, and which can make it worse.

Supplements Making Acid Reflux Worse -- Man with acid reflux pain

Product Review

Turmeric and Curcumin Supplements and Spices Review

See Our Top Picks Among Turmeric Products

CL Answer

What is Prelief? Does it really help for heartburn and/or bladder pain from acidic foods?

Prelief information, including what it has been claimed to do (such as helping with painful bladder, frequent urination, heartburn or indigestion from acidic foods), clinical evidence, and safety.

Product Review

Alginate Supplements Review (For Reflux)

See Our Top Pick Alginate Supplements For Reducing Symptoms of Gastroesophageal Reflux (GERD)

Alginate supplements reviewed by

CL Answer

I have IBS and don't want to take medication if I can help it. I've heard that peppermint works for IBS, but is there good research to support this?

Information about using peppermint oil for irritable bowel syndrome (IBS), including clinical evidence, dosage, safety and more.

Peppermint Oil for IBS? -- Bottle of peppermint oil and capsules and peppermint leaf

CL Answer

I take omeprazole (Prilosec), a proton pump inhibitor, to reduce stomach acid. Are there supplements I should avoid, or be taking, due to this drug?

Supplement interactions with proton pump inhibitor (PPI) drugs like omeprazole (Prilosec) and Nexium.

CL Answer

Is it true that low-carb or Mediterranean diets help for gastroesophageal reflux disease (GERD)?

Find out if a low-carb diet, such as the Mediterranean diet, or lifestyle changes help with gastroesophageal reflux disease (GERD).

Low-carb & Mediterranean Diets for GERD? -- Table with Mediterranean foods such as fish, olive oil, walnuts, vegetables

Clinical Update


Enzymes for Indigestion

Will taking digestive enzymes reduce indigestion? Although not all studies have shown a benefit, a recent study suggested improvements with no adverse effects. For details, see the Digestive Discomfort section of the Digestive Enzyme Supplements Review. (Also see our top choices for enzyme supplements).

Clinical Update


Ginger for Indigestion?

Can taking ginger extract help reduce symptoms of indigestion? Find out what a recent study showed in the What It Does section of the Ginger Supplements Review. Also, see our Top Picks for ginger supplements.

Clinical Update


Curcumin for Indigestion?

How well does curcumin (from turmeric) improve digestive symptoms such as indigestion, diarrhea or constipation? See what a new study found in the What It Does section of our Turmeric and Curcumin Supplements & Spices Review. Also see our Top Picks among turmeric and curcumin products.

Clinical Update


Probiotic for Indigestion?

Can taking a probiotic with a meal decrease indigestion, gas or stomach pain after eating? See what a new study found in the What They Do section of our Probiotic Supplements Review. Also, see our Top Picks among probiotics for gastrointestinal symptoms and other uses.

Clinical Update


Curcumin for Indigestion?

Can curcumin (from turmeric) reduce symptoms of indigestion? See what a new study found in the What It Does section of our Turmeric and Curcumin Supplements & Spices Review. Also see our Top Picks among turmeric and curcumin products.

Clinical Update


Curcumin for Indigestion?

Does curcumin reduce symptoms of indigestion and does it provide additional benefit if taken with the proton-pump inhibitor omeprazole? Find out what a recent study found in the Gastrointestinal Uses section of our Curcumin Supplements Review, which includes our Top Picks for curcumin.

CL Answer

Which supplements are helpful to have when traveling? Any tips on how to best store supplements on trips?

Find out which vitamins & supplements can be helpful when traveling, including melatonin, ginger, and more, and find out how you can carry them with you.

CL Answer

Which supplements or OTC medications help reduce flatulence (gas), and are there any that make it worse?

Find out which supplements may help reduce flatulence (gas), and learn which supplements or foods may worsen symptoms of flatulence.

Older woman sitting on her bed and holding her stomach due to gas and bloating

CL Answer

I read that turmeric may be a GI irritant. I have GI problems and wonder if I should avoid turmeric and curcumin?

Find out if turmeric/curcumin supplements can cause gastrointestinal irritability.

Is turmeric a stomach irritant? -- Turmeric Supplement

CL Answer

Is it true that calcium citrate increases the absorption of aluminum?

Find out how calcium citrate can impact the absorption of aluminum in your body and if this is a problem for your health.

Calcium Citrate Pills in Bottle

Product Review

Ginger Supplements, Chews & Spices Review

Tests Reveal Best and Worst Ginger Supplements & Spices. Poor Quality and Lead Contamination Discovered in Some Products.

Ginger Supplements Reviewed By

Product Review

Digestive Enzyme Supplements Review

Big Differences in Strength Found Among Digestive Enzyme Supplements. CL Tests Reveal Which Are Best.

CL Answer

Which supplements and foods help relieve constipation and which can cause constipation?

Find out which supplements can cause constipation, including iron, calcium, protein powders and drinks and others.'s answer explains.

Which supplements can cause constipation? -- Woman with gastrointestinal pain

Clinical Update


Stomach Acid Reducers

If you use medication, such as omeprazole to reduce stomach acid, be aware that this can also reduce certain vitamins and minerals in your body, and supplements can affect how well these acid reducers work. See the updated information.

Also see our CL Answer about supplements for indigestion and heartburn.

Clinical Update


Licorice Danger

A woman suffered a stroke after consuming a supplement for indigestion that contained a large dose of licorice. Get more details in our answer about licorice tea.

Product Review

Olive Leaf Extract Supplements Review

Learn What Olive Leaf Does and the Best Brands

Product Review

Probiotic Supplements Review (Including Pet Probiotics)

Probiotics: See What They Really Contain and Our Top Picks

CL Answer

What are the health benefits of black cumin seed (black seed) oil?

Find out if black seed oil has health benefits, such as lowering blood pressure or cholesterol, asthma, weight loss, and others. Dosage, forms, including black seed oil and black seed powder, safety information, using black seed oil in foods and more.'s answer explains.

Black seed oil benefits -- bowl of black cumin seeds and bottle of oil

CL Answer

A tea called Throat Coat made me lethargic and I was found to have low potassium. Is this a known problem? I was drinking 5 cups a day.

Throat Coat tea information, including licorice root content, potassium loss, and symptoms such as lethargy, increased blood pressure and fluid retention.'s answer explains.

Throat Coat Tea and Potassium Loss -- box of Throat Coat tea

News Release

February 22, 2022

Considering an Algae-based Supplement for Reflux? See What ConsumerLab Found

White Plains, New York, February 22, 2022 — Alginate supplements have been shown to be more effective than antacids in treating heartburn, indigestion, and other symptoms of GERD (gastrointestinal esophageal reflux disease).

CL Answer

Do arnica pills, gels, creams, or sprays reduce bruising, pain, or swelling?

Find out if arnica pills, gels, creams, or sprays can reduce bruising, pain, or swelling, help with varicose veins, or muscle pain after exercise.

Arnica Gel and Cream for Bruises and Pain -- tube of arnica cream

News Release

September 27, 2019

Best Turmeric and Curcumin Supplements and Spices Identified by ConsumerLab

White Plains, New York, September 27, 2019 — Turmeric and curcumin (the major compound in turmeric) are among the most popular supplements, promoted to reduce inflammation and help with conditions such as arthritis as well as indigestion and depression.

News Release

May 15, 2019

ConsumerLab Tests Reveal Big Differences in Digestive Enzyme Supplements

White Plains, New York, May 15, 2019 — Digestive enzyme supplements can help improve digestion and the absorption of nutrients, and may reduce symptoms of indigestion. But to work, they must provide a certain amount of enzyme activity.

Recalls & Warnings

March 30, 2021

Real Water Alkaline Water Recalled for Possible Link to Liver Illness

On March 24, 2021, Real Water, Inc. recalled all sizes of Real Water bottled alkaline water because it may be linked to multiple cases of non-viral hepatitis that occurred in Las Vegas, NV in November of 2020.

Recalls & Warnings

March 18, 2021

Don't Drink Real Water Alkaline Water, FDA Warns After Reports of Liver Illness

On March 16, 2021, the FDA warned consumers not to drink or use Real Water bottled alkaline water while it investigates reports of hepatitis associated with the product.

Recalls & Warnings

February 04, 2020

Seller of Digestion Supplements Warned for Manufacturing Violations

On January 10, 2020, the FDA issued a warning letter to Marco Pharma International LLC, which found the company's  Absinthium Herbal Liquid Extract 100 ml (Absinthium), promoted for "digestive support", and other products, including S21 Multi Somaplex 100 ml (Multi Somaplex), ...

News Release

April 04, 2017 Reveals Best and Worst Turmeric and Curcumin Supplements & Spices -- 31% Fail Tests of Quality

White Plains, New York, April 4, 2017 — Turmeric and its key compound, curcumin, may be help reduce symptoms of inflammation in rheumatoid arthritis and osteoarthritis and may be helpful in treating depression, diabetes, and indigestion.

News Release

December 16, 2013

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

White Plains, New York, December 16, 2013 — Supplements containing the herb turmeric or its key constituent, curcumin, are popular treatments for inflammatory diseases. ConsumerLab.

News Release

February 16, 2011

Some turmeric and curcumin supplements fail quality review -- finds 20% of turmeric supplements selected for review deliver less than 15% of promised compounds

WHITE PLAINS, NEW YORK — FEBRUARY 16, 2011 — Supplements containing the herb turmeric or its key compound, curcumin, have become popular in the U.S. cautioned today that two out of ten turmeric products recently selected for quality testing were found to provide only 7.

Recalls & Warnings

December 08, 2009

Warning on Acai Berry Supplements Spiked with Drug

On December 8, 2009, Health Canada (the Canadian health agency) advised consumers not to use certain Acai Berry products after a large number of shipments of adulterated products were stopped at the border.