In recent years, the vitamin box or chalk jar has become a fixture in many kitchens. The phenomenon is not exclusive to one country: the rise of so-called biohacking and the search for immediate well-being have promoted a market that promises energy, better sleep, more concentration and reinforced defenses, often without a medical consultation.

The problem, experts consulted by different media agree, is not that supplements are intrinsically bad, but that they have become a shortcut. And like any shortcut, it has a price if taken without a map.

When are they necessary?

The short answer, according to nutritionists and specialized doctors, is that supplementation makes sense when there is a proven deficiency or a condition that justifies it, not as a generalized preventive habit. Among the most cited situations are:

Outside of these scenarios, specialists are categorical: a varied diet - with fruits, vegetables, proteins, healthy fats and whole grains - usually covers practically all the nutritional needs of a healthy person.

The problem, they point out, is that many people do not comply with these basic recommendations and seek to compensate with a pill, when what they would need is to review their plate.

Pay attention to data, not sensations

The most frequent mistake, according to the professionals consulted, is deciding to take a supplement out of intuition: “I feel tired”, “my hair is falling out”, “I need more energy”. These symptoms can have dozens of causes—from stress to sleep problems—and are not, in and of themselves, proof of a nutritional deficiency.

Before adding any supplement to your routine, the unanimous recommendation is:

When does supplementation become the problem?

The other end of the equation - and the one that is least discussed - It is the excess. The so-called hypervitaminosis, that is, the toxic accumulation of a vitamin in the body, is more common than it seems, especially with fat-soluble vitamins (A, D, E and K), which are stored in the liver and fatty tissue instead of being eliminated through urine as is the case with water-soluble vitamins (C and group B).

The warning symptoms that specialists ask not to ignore include persistent fatigue, nausea, headaches, dizziness, digestive problems, skin changes or hair loss. In more serious cases, a sustained excess can lead to liver damage, bone disorders or kidney problems.

One of the most common causes of excess is not a single overdose, but the silent addition of several sources: a multivitamin in the morning, vitamin D separately, a fortified drink after training and some “natural” product for hair or defenses. Each one, separately, seems harmless; Together, they can double or triple the recommended dose without the person noticing, in part because labels—with micrograms, international units, and unclear names—don't always make calculations easy.

Three key questions to ask yourself

Nutritionists suggest asking yourself these questions before continuing to add jars to the cupboard:

Useful tool, not a shortcut

The consensus among nutrition professionals is that supplements are a useful tool, not a universal shortcut. They work when they correct a real deficiency, verified with objective data, and under the accompaniment of a professional who adjusts the dose and time of use. Outside of that framework, the risk of spending money on something unnecessary—or creating a new imbalance due to excess—is real.

Supplements do not replace a good diet, but they can accompany it when the diet, for whatever reason, does not work. The key is that it is a professional, and not marketing or a passing sensation, who determines when that moment has arrived.