6 Supplements Which Actually Work

Thousands of supplements being marketed by campaigns and social media influencers raise the question: "Which supplements actually work?". It is neither useful nor healthy to use every supplement in the market. Realistically there are a handful of them which actually show positive and significant results in scientific experiments. The aim of this article is to explain 6 of these supplements which have significant effects on physical appearance and performance, how and why they work so well, how to consume them and the health considerations related to supplement consumption.

1) Creatine Monohydrate

What it is: Creatine is a compound naturally found in muscle cells that helps regenerate adenosine triphosphate (ATP) — the body’s primary energy molecule. Supplementing with creatine increases the muscles’ phosphocreatine stores, allowing for faster energy recycling during high-intensity effort and let's the body to perform extra reps.

Why it works: Hundreds of studies confirm that creatine improves strength, power output, muscle mass, and recovery. It also shows emerging benefits for cognitive performance during stress, sleep deprivation, or mental fatigue — making it useful beyond the gym.

Effective dose: 3–5 g daily, any time of day. No “loading phase” is required for long-term results.

Experimental results: A meta-analysis analysing multiple studies on how creatine consumption affects the lean muscle mass(Forbes et al., 2021, Nutrients) found that creatine supplementation combined with resistance training produced average gains of ~1.2 to 1.3 kg of lean tissue mass over placebo in older adults.

Another meta-analysis comparing 15 different studies has shown that both upper body musles and lower body muscles are larger in individuals who take creatine and do resistance training compared to individual who train the same without taking creatine supplementation.

Safety: Extensively studied — safe for long-term use in healthy individuals. Drink adequate water to prevent mild gastrointestinal discomfort.

2) Protein Powders (Whey or Plant-Based)

What they are: Protein powders are concentrated sources of amino acids — the building blocks of muscle, enzymes, and hormones. The most common forms are whey, casein, and plant-based blends (pea, soy, or rice protein).

Why they work: Adequate protein intake is crucial for muscle recovery, body composition, and overall metabolic health. It could be very challenging to consume enough protein for the people who do resistance training as their daily protein goal is high. Supplementing helps individuals reach their daily protein target more conveniently, especially when dietary intake is insufficient.

Effective dose: 20–40 g per serving, ideally post-exercise or between meals to fill gaps.

Safety: Generally safe; choose third-party–tested products free from contaminants or added sugars.

3) Vitamin D3

What it is: Vitamin D is a fat-soluble vitamin that functions more like a hormone, influencing bone health, immune defense and most importantly testosterone levels. Most people, especially those in northern climates or who spend time indoors, are deficient.

Why it works: Supplementation improves calcium absorption, supports bone mineralization, and may reduce infection risk and inflammation. Low levels are linked to fatigue, depression, and weaker immunity.

Experimental Results: A meta-analysis of 17 randomized controlled trials (RCTs) found that vitamin D supplementation significantly increased total testosterone though no significant changes were observed for free testosterone, FSH, LH, SHBG, estradiol, or free androgen index.

Effective dose:1,000–2,000 IU daily for maintenance.If deficient, doses up to 5,000 IU may be needed under medical supervision.

Safety: Check blood levels (25-hydroxyvitamin D). Chronic excess can lead to toxicity, so avoid megadoses.

4) Omega-3 Fatty Acids (EPA & DHA)

What they are: Omega-3s are essential fatty acids found in fish oil and algae, crucial for cell membrane integrity and anti-inflammatory processes.

Why they work: They support cardiovascular health, improve blood lipid profiles, and may enhance cognitive function and mood. EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) are the key active forms.

Effective dose:1–3 g combined EPA/DHA per day, ideally from concentrated fish oil or algae-based supplements.

Safety:Well-tolerated; choose purified products to avoid heavy metals or oxidation.

5) Zinc

What it is: Zinc is an essential trace mineral required for enzyme function, immune defense, wound healing, and hormone balance.

Why it works: Deficiency — which is surprisingly common — impairs immune function, reduces testosterone, and slows tissue repair. Supplementation restores normal immune activity and supports metabolism, particularly during periods of stress, intense training, or illness.

Effective dose: 15–30 mg elemental zinc per day (zinc citrate, gluconate, or picolinate are best absorbed).

Safety: Avoid long-term doses above 40 mg/day to prevent copper deficiency or nausea.

6) Magnesium (Citrate, Glycinate, or Malate)

What it is:A cofactor in more than 300 enzymatic reactions, magnesium supports nervous system balance, muscle contraction, and energy production.

Why it works:Modern diets are often low in magnesium due to food processing. Supplementation may reduce muscle cramps, improve sleep quality, and lower stress by balancing the nervous system.

Effective dose: 200–400 mg elemental magnesium daily. Best forms: magnesium glycinate (for relaxation) or citrate (for digestion).

Safety: Avoid magnesium oxide (poor absorption). High doses can cause mild diarrhea.

References:

Forbes, S.C.; Candow, D.G.; Ostojic, S.M.; Roberts, M.D.; Chilibeck, P.D. Meta-Analysis Examining the Importance of Creatine Ingestion Strategies on Lean Tissue Mass and Strength in Older Adults. Nutrients2021, 13, 1912. https://doi.org/10.3390/nu13061912

Burke R, Piñero A, Coleman M, Mohan A, Sapuppo M, Augustin F, Aragon AA, Candow DG, Forbes SC, Swinton P, Schoenfeld BJ. The Effects of Creatine Supplementation Combined with Resistance Training on Regional Measures of Muscle Hypertrophy: A Systematic Review with Meta-Analysis. Nutrients. 2023 Apr 28;15(9):2116. doi: 10.3390/nu15092116. PMID: 37432300; PMCID: PMC10180745.

Abu-Zaid A, Saleh SAK, Adly HM, Baradwan S, Alharran AM, Alhatm M, Alzayed MM, Alotaibi MN, Saad AR, Alfayadh HM, Abuzaid M, Alomar O. The Impact of Vitamin D on Androgens and Anabolic Steroids among Adult Males: A Meta-Analytic Review. Diseases. 2024 Sep 25;12(10):228. doi: 10.3390/diseases12100228. PMID: 39452471; PMCID: PMC11506788.