The supplement market turns over tens of billions a year, most of it for capsules without benefit. Which twelve products bring nothing or harm in healthy people, which four almost everyone needs and how to sort your list in five minutes.
In short
- Multivitamins, antioxidants, collagen, detox, immune boosters, fat burners: no proven effect in healthy people, some with risks.
- Four candidates with good evidence for many: vitamin D in winter, omega-3 with little fish, creatine from 50 or with training, B12 on a vegan diet.
- A supplement needs three things: a deficiency or a goal, a study that supports it and a value that shows the effect.
- High-dose single vitamins can harm: beta-carotene in smokers, vitamin E, vitamin A, calcium without need.
Why most capsules bring nothing
A nutrient works when it is missing. Whoever has enough does not benefit from more, and with some vitamins more harms. The large studies with healthy people, from the Physicians’ Health Study to VITAL, have shown no benefit for heart, cancer or lifespan for multivitamins, vitamin C, vitamin E, beta-carotene and selenium, and for beta-carotene in smokers and vitamin E in high doses even raised risks. Marketing sells safety, biology knows only need.
The list of the unnecessary
Multivitamins: no benefit for people with a normal diet, the doses are too small for real deficiencies and too large for nothing. Antioxidants like high-dose vitamin C, E and beta-carotene: no protective effect, counterproductive in smokers and athletes. Collagen: broken down in the gut to amino acids like any protein; skin studies are small and manufacturer-funded. Detox and cleanse cures: liver and kidneys detoxify, capsules do not. Immune boosters with echinacea or zinc as a permanent dose: no evidence. Fat burners: caffeine at capsule prices, with liver risks. B-complex without deficiency: excreted. Calcium without need: raises kidney stones in studies and possibly cardiac events; calcium belongs in food. Iron without measured deficiency: excess harms liver and heart. Vitamin A: liver-toxic in high doses and dangerous in pregnancy. High-dose green tea extract: liver damage described. And everything that advertises longevity, anti-aging or cell protection and names no human study.
The four with evidence
Vitamin D from October to April because the sun is missing. Omega-3 from fish or algae oil when fewer than two portions of oily fish a week land on the plate. Creatine for people over 50, with strength training and with a low-meat diet. Vitamin B12 with a vegan and heavily reduced animal diet, from 60 also for meat eaters because of worse absorption. Plus by situation: magnesium with signs of deficiency, iron with measured deficiency, folic acid when trying to conceive, iodine with an iodine-poor diet.
The three-question rule
Before every capsule three questions: do I have a deficiency or a concrete goal? Are there human studies that support the effect for this goal? Which value shows me in three months whether it works? Whoever cannot answer one of the questions leaves the capsule on the shelf. The cinalia supplement check asks exactly these questions.
The test of your own list
All bottles on the table, the three questions for each, then sort: stays because supported; stays for three months with a control value; goes. Most people end with three to four products, save 30 to 50 euros or dollars a month and swallow less that harms.
Try it
Supplement CheckDiet, sun, age, sport, goals: which supplements make sense for you, which are optional and which you can skip.Blood Test CheckCholesterol, LDL, HDL, triglycerides, glucose, HbA1c, vitamin D, ferritin, TSH, CRP, blood pressure: each value with a traffic light and explanation.Vitamin D CalculatorMonth, city, skin type, minutes and how much skin is exposed: how much vitamin D your skin makes and whether it is enough in winter.Frequently asked questions
Do multivitamins harm?
At normal doses no, they just do nothing. Products with high doses of vitamin A, E, beta-carotene or iron can harm, especially in smokers and men.
Do I need more than B12 as a vegan?
B12 is mandatory, plus usually vitamin D, omega-3 from algae and depending on diet iodine, iron, zinc and calcium by blood value. A yearly blood panel settles it.
Are expensive brands better?
Not necessarily. What matters is the active form and dose on the label and manufacturing to GMP standard. Pharmacy and drugstore brands usually meet that.
This article is general information and not medical advice. If you have symptoms or existing conditions, or before changing any medication, talk to your doctor.
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