When “natural” isn’t safer: How supplements can throw your body out of balance

Supplements are often sold as a quick fix for better health, more energy, stronger immunity, glowing skin. They sit on pharmacy shelves, come with shiny labels, and promise results without much effort. So it’s easy to assume they’re harmless. But that assumption can be risky. Just because something is available without a prescription, or labeled “natural,” doesn’t mean it’s safe for everyone.The truth is, supplements can put real stress on the body, especially when taken in high doses or without medical advice. Unlike food, supplements deliver nutrients in concentrated forms, which the body isn’t always equipped to handle. Too much of certain vitamins or herbs can overload the liver and kidneys, mess with hormones, or interact badly with medicines you’re already taking. Some products are poorly regulated, meaning what’s written on the label isn’t always what’s inside the bottle.Another problem is the mindset around supplements. Many people take them “just in case,” without knowing if they actually need them. Over time, this can do more harm than good. Instead of boosting health, unnecessary supplements can quietly cause damage that only shows up when something goes wrong. When it comes to supplements, more isn’t better and food and proper medical advice still matter far more than pills.“Dietary supplements are popular choices for many who wish to improve their health, but using supplements incorrectly can have a negative impact on health. Many people take vitamin and mineral supplements without consulting their physician because they believe that high doses are beneficial. However, taking high doses of certain vitamins, especially fat-soluble vitamins (A, D, E, and K), can build up in the body and eventually lead to toxicosis. Some common signs and symptoms of vitamin toxicosis include nausea, vomiting, headaches, liver damage, and heart arrhythmia,” Dr. Santosh Kumar Agrawal, Director - Internal Medicine, Yatharth Super Speciality Hospital Faridabad says.Endocrinologist shares a simple morning routine to keep blood sugar stable before breakfastOne of the biggest concerns is liver damage. The liver processes almost everything we consume, and certain supplements can overwhelm it. Supplements like green tea extract, kava, black cohosh, aloe vera, and reishi mushrooms have been linked to liver inflammation and even liver failure in otherwise healthy people. In some cases, people needed hospitalization just because of “health” supplements they believed were harmless.Kidney damage is another serious risk. Some herbs and supplements can injure the kidneys by blocking or inflaming tiny filtering units. For example, aristolochic acid (found in some traditional remedies), excessive creatine use, and even noni juice have been linked to acute kidney failure. Very high doses of vitamin D can raise calcium levels too much, causing calcium to deposit in the kidneys and permanently damage them. Large studies have found that regular multivitamin dose does not prevent heart disease and may increase cancer risk. Long-term iron supplementation has been linked to higher chances of colorectal cancer. Beyond individual studies, poison control data paints a worrying picture. Thousands of supplement-related exposures are reported every year, with some leading to coma or death. Many products are contaminated, mislabeled, or mixed with hidden drugs. Others interact dangerously with prescription medicines.“Natural” doesn’t automatically mean safe. Unless a doctor has identified a real deficiency or medical need, taking supplements casually or in high doses can do more harm than good. Food, not pills, should be the first source of nutrition, and caution should always come before hype.“Another problem associated with dietary supplements is the interactions that can occur between supplements and prescription medications. Some dietary supplements can decrease the effectiveness of prescription medications. For other supplements, there is an increased chance of experiencing side effects when taking the two products at the same time. Additionally, some dietary supplements used for weight loss and muscle building may contain hidden ingredients that can increase the risk of hypertension (high blood pressure), cardiac irregularities, anxiety, and insomnia,” Dr. Santosh Kumar Agrawal says.Overdependence on dietary supplements can:“Thus, supplements should only be used when necessary and under the supervision of a doctor,” the expert warns.Medical experts consulted This article includes expert inputs shared with TOI Health by: Dr. Santosh Kumar Agrawal, Director - Internal Medicine, Yatharth Super Speciality Hospital FaridabadInputs were used to explain why supplement overdose is a big health risk and why one should consult doctor before taking natural alternatives.