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CL Answers (19)

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Supplements for Brittle Nails -- healthy nails

Can vitamin supplements strengthen brittle nails?

Learn more about strengthening brittle nails with vitamin B-7 (biotin), based on clinical evidence.
Biotin Supplements for Hair and Nails -- woman looking at hair and nails in mirror

Do biotin supplements really improve hair and nails?

Does Biotin really work for hair and nails? Find out about strengthening and growth for hair and nails.
Do Sugar Bear Vitamins Work? -- bottle of Sugar Bear vitamins

Do Sugar Bear Hair Vitamins make hair shine, nails stronger, and help both to grow? They taste good but are super expensive.

Info on Sugar Bear Hair vitamins. Do they make hair shine, nails stronger and help hair and nails grow? ConsumerLab.com's answer explains.

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.
Does BioSil Strengthen Hair, Skin and Nails? -- Bottle of BioSil

Does silica have health benefits? What is BioSil, and can it really increase collagen production and strengthen hair, skin, nails and bones?

Information about the health effects of silica (silicon dioxide) and orthosilicic acid (an ingredient in BioSil), including whether these forms of silicon can really increase collagen production, thicken hair, strengthen nails & bones.
Supplements for Hair Loss -- woman looking at hairbrush

Do hair loss supplements work, such as Viviscal?

Vitamins and supplements that may help with hair loss and thinning, including saw palmetto, beta-sitosterol, protein, iron, and vitamin D.

What are the signs of iron deficiency anemia?

Find out the signs and symptoms of iron deficiency anemia, such as fatigue, shortness of breath, rapid heartbeat and others.
Collagen Supplements for Joint Pain

Does collagen taken as a supplement help with arthritis? I'm seeing it in products for joint health.

Learn more about collagen supplements, including evidence from clinical studies on arthritis and muscle strength and safety.
How Much Bone Broth Should I Consume to Get a Benefit? -- Cup of Bone Broth

How much bone broth do I need to consume in order to get a benefit?

Bone broth daily consumption information and benefits, including how much protein and collagen ConsumerLab found in popular products. ConsumerLab.com's answer explains.
Collagen Supplements for Wrinkles? -- woman looking closely at her face in a mirror

Do collagen or hyaluronic acid supplements really help aging or wrinkled skin?

Find out if collagen & hyaluronic acid supplements really help for aging or wrinkled skin and for skin care.
Levothyroxine (Synthroid) Supplement Interactions

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.
Woman holding various vitamins and supplements in her hands

Which supplements can help treat anemia? Can any supplements cause a low red blood cell count?

Find out which vitamin and nutrient supplements can help prevent and treat anemia in people who are nutrient deficient and learn which supplements may cause low bleed cell counts, especially when used in excess.
Problems With Gummy Vitamins -- bottle of gummy vitamins

Is there cause for concern with "gummy vitamins?" There are many different gummies out there. Are some better than others?

Learn more about gummy supplements, including those for multivitamins, vitamins C and D, calcium, and B vitamins.
B Vitamins

I thought the B vitamins were all water soluble and did not build up in the body, so you would not build up toxic levels. Am I wrong?

Learn more about water-soluble B vitamins including niacin, B6, B12 and folic acid, and why taking too much of these vitamins can be toxic. See the symptoms of overdose and toxicity from B vitamins. ConsumerLab.com's answer explains.

Does tea tree oil work for getting rid of athlete's foot?

Learn more about tea tree oil and its effects on foot fungus (known as athlete’s foot, tinea pedis, or “ringworm” due to the lesion that can occur) and how it can be as effective as some, but not all, over-the-counter antifungal treatments. ConsumerLab explains.

Best Pulse Oximeter for Home Use -- Pulse Oximeter

Which is the best pulse oximeter for home use?

Best pulse oximeter for home use (COVID-19, asthma and COPD). Differences between home use and FDA-approved medical pulse oximeters.

Grape Seed Extract

What are the benefits of grape seed extract?

Learn more about grape seed extract, including evidence from clinical studies on prehypertension.
Woman holding various vitamins and supplements in one hand and glass of water in the other

Are supplements such as Thyroid Care Plus helpful for hypothyroidism? Can supplements worsen thyroid function? And what is nascent iodine?

Learn about supplement ingredients such as iodine, selenium, zinc, acetyl-l-carnitine, ashwagandha and guggul used for thyroid conditions and find out if they are beneficial. Also learn why ingredients such as alpha-lipoic acid, soy, resveratrol, quercetin may impair thyroid function.
Supplements for Seasonal Allergies -- Woman Outside Sneezing

Which supplements are best for seasonal allergies?

Find out which supplements are best for allergies and can help reduce seasonal allergy symptoms, including bromelain, curcumin, vitamin D, and CLA.
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Clinical Updates (1)

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Eggshell Membrane for Hair, Skin, Nails?
Does supplementing with eggshell membrane (which contains collagen and elastin) improve hair, skin, or nails? See what a recent study found in the What It Does section of the Collagen Supplements Review. Also see our Top Picks among collagen supplements.
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