22 Warning Signs Your Vitamins Aren’t Going to Work

Updated: Apr. 01, 2020

Avoid buying into the false claims of vitamins and dietary supplements. Here are some warning signs that they aren't going to work like you hope they will

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Why your vitamins may not work

A healthy diet is one of the best ways to get the nutrients your body needs. However, if your diet lacks specific nutrients, vitamins and dietary supplements can act as nutritional reinforcements to help meet these needs. Dietary supplements are regulated by the U.S. Food and Drug Administration (FDA) more like foods, not prescription drugs, which means manufacturers can’t claim their product yields specific health benefits without scientific proof. The FDA does not require supplements to be proven safe before coming to market.

Avoid buying into the false claims by looking for these warning signs your vitamins aren’t going to work.

Human hand take out bottle with vitamin pills from the box for reading Nutritional information.

The label boasts more than 100 percent of the US RDA

More is better, correct? Not so fast, warns Sreekant Cherukuri, MD, an otolaryngologist in private practice in Munster and Hobart, Indiana, who runs SmartCeuticals, a website dedicated to raising consumer awareness about supplement use. “If any vitamin or mineral states that it contains more than 100 percent of the US Recommended Dietary Allowance (RDA) for that nutrient, stay away,” he says. Fat-soluble vitamins—namely A, D, E, and K—are stored in the body and can accumulate and cause harm.”High doses of certain fat-soluble vitamins such as vitamin A and vitamin E have been linked to cancer.” Water-soluble vitamins such as vitamins B and C, when taken in too-large doses, will just leave your body in urine. “Your money literally goes down the drain.” These are some of the vitamin mistakes you may not realize that you are making. If you take vitamins or supplements, check the label to make sure the US RDA is 100 percent or less.

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The pitch sounds too good to be true

Vitamin and supplement manufacturers are not allowed to make claims that their product can reverse, prevent, or diagnose any disease or condition, but that doesn’t mean they don’t or won’t. “If the claim is outrageous and suggests the product is indicated for any disease as opposed to general health, that’s a warning sign,” Dr. Cherukuri says.”If it sounds too good to be true, walk away. They won’t help and they may harm.” Check out these six vitamin myths you have to stop believing.

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The bottle doesn’t have a legit seal of approval

It’s a good idea to look for third-party validation that says what you are buying is actually in the bottle. The “US Pharmacopeia Verified” mark, ConsumerLab Seal of Approval, or an NSF seal are good signs that you are getting what you paid for. “I’d be highly skeptical of any other seals as many companies may create fake ones to gain your trust and your business,” says Dr. Cherukuri.

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Celebrity endorsement is the only endorsement

Yes, Gwyneth Paltrow swears by her Goop vitamin line, but a celebrity endorsement alone (even if it is that of TV’s Dr. Oz) is not enough to show that a vitamin is safe or effective, Dr. Cherukuri says. Make sure the vitamin or supplement has a seal of approval from a legitimate organization as this shows that independent testing has been performed. Here are eight vitamin secrets manufacturers don’t want you to know.

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You count on your multivitamin

Sorry, but about half of all multivitamins don’t do what they say. Fully 46 percent of the multivitamins tested by ConsumerLab failed to live up to their labels. Too much or too little of key nutrients can jeopardize health. A better bet? “Get these vitamins, minerals, and antioxidants from whole fruits and vegetables as part of a healthy diet, as there is so much we don’t know about putting these nutrients in a pill,” Dr. Cherukuri says. No supplement comes close to replicating all of the benefits found in a whole food.

Close-up of white plastic jar with supplement facts of multivitamins in woman hands.

You take the label too literally

“If you are taking folic acid you may be getting as much as 70 percent more of this B vitamin than you need based on the older DV information,” says Tod Cooperman, MD, president of ConsumerLab in White Plains, New York. “There is an upper limit for folate from folic acid and we know that very high levels can cause kidney damage or mask vitamin B12 deficiency,” he says. By contrast, relying on the DV for vitamin D could put you at risk for a shortfall of this important vitamin. And don’t miss the updated DV info that can help guide you when you’re shopping for supplements.

Woman taking pills for her health

The doses are too low

Some vitamins and minerals may contain amounts that are too low to make any meaningful difference, Dr. Cooperman says (and this assumes that what you read on the label is actually what you are getting.) “Manufacturers don’t have to put in effective amounts, so it’s up to the purchaser to do their due diligence and know what they need and how much they are actually getting,” he explains. When in doubt, ask your pharmacist or doctor, or visit a reliable source on the Internet. Are your current vitamins delivering the dose you think they are? Check out these silent signs of vitamin deficiency.

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You don’t follow the label instructions

You’ll absorb some vitamins better with food; others are best on an empty stomach. If you don’t take them as directed, your vitamins won’t have the desired effects and they may make you feel lousy, Dr. Cooperman says. Check out more simple ways to make your vitamin more effective.

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Your pills are filled with junk

Some of the very same artery-clogging hydrogenated fats and oils that you try to avoid in food may be in vitamin as cheap fillers. Other fillers are flat out dangerous—such as magnesium silicate (aka talc), which is similar to asbestos in composition and can cause stomach and lung problems if you inhale or swallow it. Avoid these risky fillers by reading the label and researching unknown ingredients.

White round pills on wood spoons and medicines decorated on wood table

Key ingredients are missing

It’s time to get the facts straight about probiotics: To rebalance your gut microbiome, probiotics should have multiple strains of bacteria, says Dr. Cooperman. There are many different types of bacteria, and some single-strain probiotics are fine, but multi-strains may be better. Read the labels and do your research.

Orange capsule on bottle and white round pills on light blue table, healthcare

The supplements are too pretty

Here’s the deal: Dyes are only added to vitamins to offset the color loss from exposure to light, air, temperature extremes, moisture, and other conditions, or to enhance the appearance of the vitamin. Some dyes may be dangerous. The American College of Healthcare Sciences in Portland urges supplement-takers to steer clear of these risky dyes: FD&C Blue No. 1, FD&C Blue No. 2, FD&C Green No. 3, FD&C Red No. 3, FD&C Red No. 40, FD&C Yellow No. 5, and FD&C Yellow No. 6. “We urge everyone to eat the rainbow because color is good in natural foods, but the same does not hold for supplements,” adds Boston-based nutritionist Dana Greene, RD.

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You’re storing them incorrectly

Markets may store vitamins and minerals incorrectly—they don’t refrigerate the probiotics, for example—and you may store them poorly yourself—if you’re keeping your vitamins in a humid bathroom. In fact, the bathroom isn’t an appropriate place for storing other medications because of the humidity and temperature changes. Incorrect storage can compromise the effectiveness of your supplements, and they won’t work as well as they could or should.

Girl On Bed Taking Pill With Water Glass In Bedroom

They’re expired

This isn’t necessarily a red flag, says Dr. Cooperman, as the pills may contain up to 30 percent more of the active ingredients than the label claims, he says. “Companies want to make sure the vitamins remain potent through the date of expiration, so it’s likely that they will contain 100 percent of what is claimed come expiration time.” These are the 16 vitamins and supplements that doctors take every day.

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They are made outside the country

Makers outside the U.S. don’t have to adhere to government rules on purity, Dr. Cooperman says. So you can’t be sure the bottles contain what you think they do. Just like purchasing prescription drugs over the Internet from foreign countries is risky business, purchasing vitamins over the Internet can be risky, too. These are the other things your pharmacist wants you to know.

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The label claims a top-secret blend

Dr. Cooperman suggests being skeptical when a manufacturer boasts. Especially when they boast about a proprietary formula or blend, he says. “You want to see specific amounts of each ingredient listed, not vagaries.”

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You don’t take them in the right combination

Some vitamins and minerals function better together, such as vitamin D, Vitamin K, and calcium. Vitamins D and K help the body and bones absorb calcium, so taking them together is one of many simple ways to boost your bones. Other winning combos include iron and vitamin C; vitamin C helps the body release a higher percentage of iron. Ask your doctor or pharmacist for advice about vitamins that work better when taken in combination.

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You take supplements in dangerous combinations

Many of us take supplements daily to improve our health and well-being—but taking certain vitamins and minerals together can be dangerous. Taking magnesium and calcium together can lessen the power of both. Make sure you know about the supplements and medications you should never mix.

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You put too much trust in the process

Under the Dietary Supplement Health and Education Act (DSHEA), vitamin manufacturers are responsible for ensuring that their supplements are safe—not the U.S. Food and Drug Administration, as is the case with drugs. A 2018 study published in the Mayo Clinic Proceedings found that some over-the-counter dietary “adrenal support” supplements contained traces of thyroid hormone and most contained at least one steroid, even though none of the labels listed those powerful and potentially risky ingredients. “These results may highlight potential risks of hidden ingredients in unregulated supplements,” the study authors conclude.

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You’re not using an MD-approved brand

There are some vitamin brands that doctors trust. “It’s usually a better bet to go with a well-known company, as they are more likely to do the research and pursue independent testing,” Dr. Cooperman says. These are the 14 vitamin brands doctors trust the most.

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You don’t need what you are taking

Some people do need more of a certain vitamin or mineral for health reasons, but the only way to know for sure is by getting a blood test to see where you stand. Talk to your doctor about measuring the levels of key nutrients in your blood so you can be sure you are only getting what you need. Most annual checkups include blood work that reports on vitamin D, a crucial supplement.

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It’s a gummy

Independent testing by ConsumerLab shows that some gummy supplements—particularly gummy multivitamins—don’t contain their listed amounts of vitamins or minerals, while others have impurities. “We continue to find more problems with candy-like vitamins like gummies than with traditional forms, such as tablets and caplets… manufacturing challenges associated with candy-like products likely explain the higher incidence of problems,” according to their website. Some gummies are worse than others. “I’m particularly concerned about folic acid in gummies,” says Dr. Cooperman. “Many gummies contain far too much because manufacturers know it can break down rapidly in a gummy.” This could especially be a concern for kids, warn pediatricians.

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It’s the right vitamin in the wrong form

Form matters a lot when it comes to the absorption of certain nutrients, says Dr. Cooperman. Take magnesium, for example: Magnesium citrate and magnesium chloride may be better absorbed and tolerated than magnesium oxide. There are also pros and cons when it comes to liquid vitamins, he says. “A benefit of a liquid is that you avoid the risk that an improperly made pill won’t fully release its ingredients,” he says. However: “A risk of a liquid is that some ingredients are less stable in a liquid environment, resulting in a loss over time.” Talk to your doctor or pharmacist about which form is best for you. Before you go around claiming you’re an expert on vitamins, read about the secrets vitamin manufacturers don’t want you to know.