A varied diet usually meets most needs, but work, exercise and lifestyle still lead many people to consider additional support. Here we explain the difference between the nutrients themselves and the products sold in shops and online.
Why the terms get mixed up
Vitamins and minerals often share a container with other substances, so everything ends up under the label supplements. However, vitamins and minerals are natural nutrients, while supplements are a product category.
Supplements are regulated as foods and must meet requirements covering safety, permitted ingredients, labelling and claims, among other things. Compliant packaging alone does not make every ingredient permissible. An individual product therefore does not need advance authorisation from the Swedish Medical Products Agency in the same way as a medicine.
Vitamins
Vitamins are organic molecules that the body either cannot produce or produces only in very small amounts. They are divided into fat-soluble vitamins (A, D, E and K) and water-soluble vitamins (C and the B group).
Fat-soluble vitamins are stored in fat tissue and can accumulate to harmful levels if intake is excessive. Water-soluble vitamins are not stored in the same way, but high doses can still be harmful, for example vitamin B6. Swedish nutritional data generally show adequate supply, with a clear exception for vitamin D because the skin produces it only during the summer months.
This also explains why D3 is one of the most common supplements in Sweden, often combined with K2, which interacts with vitamin D in the body. Large studies have not found additional health benefits from high doses in people already eating well. More is therefore not better.
Minerals and trace elements
Minerals are inorganic elements the body needs for structure and regulation. Magnesium contributes to nerve and muscle function, sodium regulates fluid balance, and calcium is important for the skeleton.
Trace elements are minerals needed in very small amounts, such as zinc, selenium and boron. Zinc is among the minerals involved in the body's hormone production, while a corresponding established hormonal benefit from boron supplementation has not been demonstrated.
Most people in Sweden achieve recommended levels, but requirements vary between individuals. Limited eating habits, high energy expenditure or reduced intestinal absorption have an influence, so the same menu can produce different blood values in two people depending on genetics, age and lifestyle.
What are supplements?
Supplements are concentrated sources of nutrients or other substances with physiological effects. They are sold as capsules, tablets, powders or drops and are intended to complement food rather than replace it.
The category is broad. It includes pure vitamins and minerals, plant extracts such as Ashwagandha and Ginkgo Biloba, mushrooms such as Lion's Mane and Reishi, and amino acids such as L-Tyrosine and L-theanine.
The rules prohibit medicinal promises but permit authorised health claims, when their conditions are met, such as "contains vitamin C, which contributes to the normal function of the immune system". This is why reputable manufacturers word their claims carefully: the difference between what may be written and what someone would like to write is often larger than expected.
The form affects what your body can use
Two containers with the same milligram amount on the label can behave quite differently in the body. This concerns bioavailability: how much of the contents is actually absorbed.
Magnesium glycinate is gentler to absorb than magnesium oxide despite identical figures on the front. Similar considerations apply to zinc, where picolinate and citrate forms differ, and particularly to plant extracts, where standardisation to a stated concentration of an active substance matters.
This is also why 150 percent of daily reference intake on the container does not mean 150 percent in the body. Review your diet first, choose reasonable doses, and use supplements to fill gaps rather than replace your entire plate.