Vitamins & Supplements Archive

Online tools enable consumers to vet dietary supplements before taking them. That's important, since dietary supplements sometimes contain hidden prescription drugs, controlled substances, or untested and unstudied components. Some of the most reliable tools to vet supplements are provided on the websites of the FDA, National Institutes of Health, and Department of Defense. Consumers can look up basic information about dietary supplements, clinical evidence about their use and effectiveness, suspicious ingredients they may contain, and safety violations.

Some supplements can interfere with lab tests to diagnose or monitor health conditions, which can lead to life-threatening misdiagnoses or unnecessary additional testing. Biotin (vitamin B₇) can skew results from a blood test to diagnose heart attack. Other problematic supplements include vitamin C, which can interfere with blood sugar readings and stool tests; calcium, which can make bones appear denser than they are on bone density scans; and creatine, which can lead to falsely high readings of creatinine, a marker for kidney disease.

I'm 79 years old and have been taking 3,000 mg of vitamin C a day for years. I'm now uneasy about taking this amount and plan to cut back to 1,000 mg daily. Is this the right dose? Will my body be startled by the abrupt change?

A study published by JAMA Network Open found that people taking vitamin D supplements were less likely to have a cancer that spread from the original tumor site to another part of their body or one that proved fatal. However, this risk reduction was only seen in people who were at a normal weight, not those who were overweight or obese. The study did not find that people who took vitamin D were less likely to develop cancer over all compared with those who did not.

A 2022 study found that vitamin D deficiency significantly increases the likelihood of age-related loss of muscle strength, known as dynapenia, a major risk factor for falls.

When it comes to managing high blood pressure, the average American consumes too much sodium and too little potassium. Reversing this imbalance could help control high blood pressure which could, in turn, lead to fewer heart attacks, strokes, and deaths from heart disease.

In November 2022, the FDA called out seven supplement companies for illegally claiming their products could treat or prevent cardiovascular disease, such as atherosclerosis or heart failure.

A 2022 study found that a statin drug lowers LDL cholesterol better than six popular dietary supplements. While not everyone with high LDL needs a statin, these drugs are proven to lower heart attack risk in people who have or are at high risk of heart disease based on a common risk calculator. Dietary supplements such as cinnamon, garlic, and turmeric aren't helpful for addressing heart-related risks, and product labels often offer false promises regarding cardiovascular benefits.

Statins were more effective at lowering cholesterol levels compared with six dietary supplements touted for heart health benefits, including managing cholesterol.