In short:
- Regular training is the foundation — supplements can support it, but they do not replace it.
- Creatine monohydrate and protein supplements are the best-supported supplements for gaining muscle mass and strength alongside training.
- For a healthy person with balanced nutrition, the added value of supplements is modest.
- Consult a healthcare professional before using any new supplements, especially if you take medication or have a chronic condition.
Comparing supplements and exercise is a question that concerns everyone interested in athletic goals: is regular physical activity enough, or are supplements just as important? Research is providing ever more precise answers, and according to most of the evidence, training is the foundation on which supplements can play a supporting role. A clear understanding of how the two relate helps you make smarter decisions for both your health and your athletic goals.
What does the scientific literature say about supplements versus exercise?
A large meta-analysis of the effects of protein supplements (Morton et al., 2018), covering more than 1,800 participants, showed that additional protein intake increased muscle mass gains in the training groups by an average of 0.3 kg more than in the placebo group — although this effect does not appear without regular training. The researchers stressed that the effect of supplements depends directly on the intensity and consistency of training.
For more detail on the best time to take supplements, see the article Timing your supplement intake, which covers when to take supplements before and after training.
EFSA has confirmed health claims for only a few specific substances — for example, the role of creatine in improving performance during repeated short-term high-intensity efforts, and the contribution of vitamin D and calcium to the normal condition of bones (EFSA Journal, 2011). For most popular supplements, scientific consensus is either lacking or weak.
Can you get good results from training without supplements?
For most healthy adults, the answer is yes. Regular strength and endurance training improves muscle mass, cardiovascular health and metabolic function on its own — without any supplements.
Creatine has been studied in numerous clinical trials. Rawson & Volek (2003) found that adding creatine to strength training increased upper-body strength measures compared with training alone — so creatine adds measurable value to training, but in an untrained person the effect is practically nonexistent.
New product lines offer training-focused supplements and, according to studies, work best against a background of regular training.
Which supplements are evidence-based when combined with training?
Not all supplements on the market are backed equally by scientific evidence. Here is an overview of the best-supported ones:
Creatine monohydrate is one of the most studied substances among sports supplements. The meta-analysis by Lanhers et al. (2017) confirmed a statistically significant strength gain in upper-body exercises. The NIH Office of Dietary Supplements notes that creatine monohydrate is safe for short-term use in healthy adults (NIH ODS, 2023).
Protein supplements support muscle protein synthesis after training. Morton et al. (2018) recommend about 1.6 g of protein per kilogram of body weight per day for active people — most can cover this with an ordinary diet, without needing supplements.
Caffeine has clearly proven itself in endurance and strength training. The umbrella review of 21 meta-analyses by Grgic et al. (2020) found that caffeine improved athletic performance by an average of 16% compared with placebo — one of the largest effect sizes among all supplements.
Beta-alanine supports carnosine levels in the muscles and delays the fatigue threshold. The meta-analysis by Hobson et al. (2012) showed that beta-alanine improved performance primarily in training loads lasting 1–4 minutes, where lactate accumulation is the limiting factor.
How do you choose the right supplements to go with your training?
When deciding, it is worth keeping the following principles in mind:
- Training is the priority. No supplement replaces regular, progressive training.
- Check your nutrition first. Most supplements only become relevant once your basic nutrition is balanced and adequate.
- Choose evidence-based supplements. Creatine monohydrate, quality protein and caffeine are among the most studied options.
- Take your individual needs and health status into account. A vitamin D deficiency or low iron levels may call for targeted supplements.
Cooperation between universities in evaluating supplements is an important step toward better informing consumers — see, for example, Supplement tasting at TÜ ASK, which assessed the composition and quality of various products on the Estonian market.
The NIH Office of Dietary Supplements recommends consulting a healthcare provider before using supplements, especially for people who take medication or have chronic conditions (NIH ODS, 2023).
References
- Morton RW, Murphy KT, McKellar SR et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength in healthy adults. Br J Sports Med. PMID: 28698222
- Rawson ES & Volek JS (2003). Effects of creatine supplementation and resistance training on muscle strength and weightlifting performance. J Strength Cond Res. PMID: 14636102
- Grgic J, Grgic I, Pickering C et al. (2020). Wake up and smell the coffee: caffeine supplementation and exercise performance — an umbrella review of 21 published meta-analyses. Br J Sports Med. PMID: 30765340
- Hobson RM, Saunders B, Ball G et al. (2012). Effects of β-alanine supplementation on exercise performance: a meta-analysis. Amino Acids. PMID: 22270875
- Lanhers C, Pereira B, Naughton G et al. (2017). Creatine Supplementation and Upper Limb Strength Performance: A Systematic Review and Meta-Analysis. Sports Med. PMID: 27328852
- EFSA Panel on Dietetic Products, Nutrition and Allergies (2011). Scientific Opinion on the substantiation of health claims related to creatine and increase in physical performance during short-term, high intensity, repeated exercise bouts. EFSA Journal. DOI: 10.2903/j.efsa.2011.2303
- NIH Office of Dietary Supplements (2023). Exercise and Athletic Performance: Fact Sheet for Health Professionals. ods.od.nih.gov/factsheets/ExerciseAndAthleticPerformance-HealthProfessional/
Frequently asked questions
Do supplements replace training?
No. No supplement can replace the effect that regular training has on your muscles, cardiovascular system and overall health. Supplements can support training, but they cannot replace it.
Which supplement is best for someone doing strength training?
Based on the scientific literature, creatine monohydrate is the best-supported supplement for strength training — a conclusion backed by both the NIH ODS and numerous meta-analyses.
Do I need protein supplements if I eat a balanced diet?
Usually not. Most people get enough protein from balanced nutrition (about 1.6 g/kg per day). Protein supplements are practical when it is hard to meet your protein needs through food alone.
How long does it take for supplements to start working?
It depends on the supplement. The effects of caffeine kick in within 30–60 minutes, the carnosine-boosting effect of beta-alanine needs 4–8 weeks of regular use, and a creatine loading phase usually lasts 5–7 days.
Is it safe to take supplements without a doctor’s recommendation?
Most supplements are safe for healthy adults, but the NIH ODS recommends consulting a healthcare professional before use, especially if you take medication or have a chronic condition.
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