What are dietary supplements?
Dietary supplements are substances taken to complement the diet and improve health. They can contain vitamins, minerals, amino acids, and other components that help the body function more efficiently.
The role of supplements in maintaining health
Supplements can play an important role in maintaining health, especially when the diet does not provide all the necessary substances. They can help:
- Eliminate deficiencies in vitamins and minerals,
- Support the immune system,
- Promote improved metabolism.
For example, vitamin D is associated with the prevention of various diseases, including metabolic and cardiovascular disorders [1].
Types of supplements
There are several main types of dietary supplements:
- Vitamins - important compounds necessary for many biochemical processes in the body.
- Minerals - elements such as calcium and magnesium that support bone health and other functions.
- Amino acids - building blocks of proteins necessary for growth and tissue repair.
- Collagen - a supplement popular for improving skin and joint health [2].
When choosing supplements, it is important to consider individual needs and possible deficiencies, which can be determined through medical tests [3].
Why it works: mechanisms of action of supplements
Dietary supplements act on the body through various mechanisms, depending on their composition. The main principle is that they replenish deficiencies in nutrients necessary for the normal functioning of the body.
The role of nutrient deficiencies
Deficiencies in vitamins and minerals can lead to various diseases and disorders. For example:
- Vitamin D: deficiency may be associated with bone and immune system diseases [1].
- Iron: its deficiency often causes anemia, especially in women and children [4].
- Collagen: deficiency may contribute to skin aging and reduced elasticity [2].
Supplements help to replenish these deficiencies, improving overall health and reducing the risk of diseases.
Scientific data on the effects of supplements
Research shows that certain supplements can have a positive impact on health:
- Vitamin D: its intake is associated with improvement in various diseases, including cardiovascular [1].
- Iron: supplements help increase hemoglobin levels and improve physical performance [4].
- Collagen: studies show its effectiveness in improving skin hydration and elasticity [5].
This data highlights the importance of choosing the right supplements to maintain health and prevent deficiencies.
How to use dietary supplements?
Recommendations for choosing supplements
The choice of dietary supplements should be based on individual needs. It is recommended to consider the following factors:
- Age: Nutritional needs for vitamins and minerals may change with age.
- Gender: Women may need additional supplements, such as iron and calcium, at certain life stages [4].
- Health: People with chronic diseases, such as kidney diseases, may require specific supplements [3].
- Diet: Vegetarians and vegans may need supplements of vitamin B12 and iron.
Dosage and timing advice
Dosage and timing of supplements play an important role in their effectiveness. General recommendations include:
- Follow the instructions on the packaging or your doctor's prescriptions.
- Take supplements with food to improve absorption, especially fat-soluble vitamins like vitamin D [1].
- Regularity: The use of supplements should be consistent to achieve results.
It is also important to note that supplements do not replace a balanced diet. They should be used in conjunction with a diverse and balanced diet.
Combining supplements with a full diet helps ensure the body receives all necessary nutrients and improves overall health. For example, collagen can be beneficial when combined with foods rich in vitamins and minerals to support skin health [2].
Risks and contraindications
Potential risks
Improper use of dietary supplements can lead to various health risks. For example, excess vitamins and minerals can cause toxicity. Some supplements may interact with medications, increasing the likelihood of negative consequences.
Common risks include:
- Overdose of vitamins such as vitamin A and D, which can lead to serious health issues.
- Allergic reactions to supplement components.
- Digestive disturbances, such as diarrhea or constipation.
Contraindications and recommendations
Some supplements have contraindications and may cause side effects. For example, iron supplements can be dangerous for people with certain conditions, such as hemochromatosis [4].
It is recommended to consider the following points:
- Consult a doctor before starting supplements, especially if you have chronic diseases.
- Research possible side effects and contraindications of specific supplements.
- Assess the need for supplements based on dietary analysis and health status.
Before starting supplements, it is important to get professional advice to avoid potential risks and negative health consequences [3][1][6].
Comparison of dietary supplements for better health
| Supplement | Benefits | Recommended for | Cons |
|---|---|---|---|
| Vitamin D | Improves bone health and immunity | People with low vitamin D levels, elderly | Risk of hypercalcemia with excess |
| Creatine | Increases muscle mass and strength | Athletes, women during menopause | May cause water retention |
| Collagen | Supports skin and joint health | People over 30 wanting to improve skin condition | Effect may be minimal without other measures |
| Magnesium | Improves muscle and nerve function | Athletes, people with high stress levels | Excessive intake may cause diarrhea |
The diagram shows the relative popularity of various dietary supplements for better health on a scale from 1 to 10. The values are illustrative and based on consumer surveys.
Common questions
Which supplements are best for improving health?
The choice of supplements depends on individual needs. Vitamin D, omega-3 fatty acids, and magnesium are popular supplements for overall health improvement [1][7].
How can I tell which vitamins and minerals I lack?
It is recommended to have blood tests to determine levels of vitamins and minerals. Consulting a doctor can help identify deficiencies and select necessary supplements [3][4].
Can I get all the necessary nutrients from food without supplements?
Yes, with a diverse and balanced diet, it is possible to obtain all necessary nutrients. However, in some cases, such as with certain diseases or dietary restrictions, supplements may be beneficial [8].
Are there supplements that can be harmful?
Yes, some supplements can have side effects or interact with medications. It is important to consult a doctor before starting any supplements [6][9].
How to choose quality supplements on the market?
When selecting supplements, pay attention to their composition, the manufacturer's reputation, and the presence of quality certificates. Reading reviews and recommendations can also help in making a choice [2][10].
Determine your nutrient needs before choosing supplements.
This material is informational and does not replace a doctor's consultation.
References
- [1] Demay MB, et al. Vitamin D for the Prevention of Disease: An Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2024. PMID: 38828931. https://doi.org/10.1210/clinem/dgae290 PubMed
- [2] de Miranda RB, et al. Effects of hydrolyzed collagen supplementation on skin aging: a systematic review and meta-analysis. Int J Dermatol. 2021. PMID: 33742704. https://doi.org/10.1111/ijd.15518 PubMed
- [3] Ikizler TA, et al. KDOQI Clinical Practice Guideline for Nutrition in CKD: 2020 Update. Am J Kidney Dis. 2020. PMID: 32829751. https://doi.org/10.1053/j.ajkd.2020.05.006 PubMed
- [4] Pasricha SR, et al. Iron deficiency. Lancet. 2021. PMID: 33285139. https://doi.org/10.1016/S0140-6736(20)32594-0 PubMed
- [5] Myung SK, et al. Effects of Collagen Supplements on Skin Aging: A Systematic Review and Meta-Analysis of Randomized Controlled Trials. Am J Med. 2025. PMID: 40324552. https://doi.org/10.1016/j.amjmed.2025.04.034 PubMed
- [6] Virani SS, et al. 2023 AHA/ACC/ACCP/ASPC/NLA/PCNA Guideline for the Management of Patients With Chronic Coronary Disease: A Report of the American Heart Association/American College of Cardiology Joint Committee on Clinical Practice Guidelines. Circulation. 2023. PMID: 37471501. https://doi.org/10.1161/CIR.0000000000001168 PubMed
- [7] Pardo MR, et al. Bioavailability of magnesium food supplements: A systematic review. Nutrition. 2021. PMID: 34111673. https://doi.org/10.1016/j.nut.2021.111294 PubMed
- [8] Volkert D, et al. ESPEN practical guideline: Clinical nutrition and hydration in geriatrics. Clin Nutr. 2022. PMID: 35306388. https://doi.org/10.1016/j.clnu.2022.01.024 PubMed
- [9] Smith-Ryan AE, et al. Creatine in women',s health: bridging the gap from menstruation through pregnancy to menopause. J Int Soc Sports Nutr. 2025. PMID: 40371844. https://doi.org/10.1080/15502783.2025.2502094 PubMed
- [10] Burke R, et al. The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis. Nutrients. 2023. PMID: 37432300. https://doi.org/10.3390/nu15092116 PubMed