In the Ekstraklasa locker room, I had a teammate who spent 600 PLN a month on supplements. A 150 PLN pre-workout, 2 different protein powders, BCAAs, glutamine, ashwagandha, testosterone boosters, 3 types of vitamins. He played great — but he also ate great, slept 9 hours, and had good genetics. The supplements probably gave him 2% more than my 120 PLN/month stack did.
I learned: supplements are the final touch. The foundations are sleep, food, and training. But the final touch matters too — if you know what works and don't fall for the rest.
5 supplements with evidence (ISSN position stand)
The International Society of Sports Nutrition (ISSN) publishes a "position stand" every 5 years — a document stating which supplements have "strong evidence of effectiveness and safety". Here are 5 that are on the list — and that matter for a goalkeeper.
1. Creatine monohydrate
The most researched supplement in sports history. Over 500 studies, with over 95% showing effectiveness. For a goalkeeper: increases muscle power by 5-15%, capacity for short, explosive efforts (jumps, throws) by 10-20%.
Dose: 3-5g daily, non-stop. No loading phase (an old myth). With anything, at any time.
Cost: 40-60 PLN per kilogram (lasts for 6-10 months).
Brand: Creapure® (German, certified purity) — e.g., Olimp Creapure, SFD Creapure. Others are also OK, as long as it's monohydrate.
2. Caffeine
A class A ergogenic aid according to the ISSN. Reduces reaction time by 3-5%, improves concentration, and raises the fatigue threshold. Ideal for a goalkeeper.
Dose: 3-6 mg/kg of body weight. For an 85 kg person: 255-510 mg. Start with 200 mg, check your tolerance. 60 minutes before a match/training.
Source: 200 mg tablet (3 PLN/each) OR 2× strong coffees (≈150 mg each). Caffeinated gums (Run Gum) work faster — 15 min.
Note: not after 2 PM if it's an evening match. It will ruin your post-match sleep and worsen recovery.
3. Vitamin D3
In Poland, 80% of the population is deficient (especially from October to March when there's no sun). Deficiency = weakened immunity (more infections = missed training), weaker muscles, worse sleep.
Dose: 2000-4000 IU daily, with a fatty meal (it's fat-soluble). Summer: 1000 IU if you're in the sun a lot.
How to check if you need it: a 25-OH-D3 blood test (60-80 PLN at any lab). The target is 40-60 ng/ml. Below 30 = supplement, above 70 = excess.
Cost: 30-40 PLN for a six-month supply.
4. Omega-3 (EPA + DHA)
Anti-inflammatory — speeds up post-match recovery, reduces DOMS (muscle soreness), improves sleep. For a goalkeeper who trains 5 times a week: a solid investment.
Dose: 2-3g of combined EPA+DHA daily (note — read the label, this is NOT the same as "1000 mg fish oil", where EPA+DHA is often only 300 mg).
Brand: Norsan Omega-3 Total, Apollo's Hegemony O3, Carlson Super DHA. 80-120 PLN for a month's supply.
Alternative: 2 servings of fatty fish (salmon, mackerel, herring) per week = similar effect without a supplement.
5. Beta-alanine
Less known, but well-researched. Increases carnosine in muscles — a buffer against acidification. The effect: you can last 1-2 seconds longer at high intensity (e.g., sprinting for a ball, a long throw-in). For a goalkeeper, its role is secondary, but if you play out, it helps.
Dose: 3-5g daily, in 2-3 doses (to avoid skin tingling). Minimum of 4 weeks to take effect.
Cost: 30-40 PLN/month.
Note: the first dose often causes skin tingling (paresthesia) — harmless, but unpleasant. It will pass after a week.
Plus optionally: 1 especially for amateurs
6. Whey protein
Technically not a supplement, but a protein concentrate. But if you have trouble eating 140g of protein a day from food — whey closes the gap.
Dose: 25-35g after training OR as a supplement during the day. No more than 50g/day (it's pointless).
Brand: isolate if you're lactose intolerant, concentrate if not. Olimp, Trec, Myprotein — solid Polish brands, 100-150 PLN/kilogram.
10 supplements that are just marketing (save your money)
1. BCAA (branched-chain amino acids)
If you eat 1.6g of protein/kg/day — BCAAs are redundant. Studies from the last 5 years have dismantled their popularity. A waste of money.
2. Glutamine
Marketing from 20 years ago. The only confirmed effect: helps wound healing after surgery. For a goalkeeper — nothing.
3. Testosterone boosters (Tribulus, D-Aspartic acid)
They don't raise testosterone in men with normal levels. If you have low testosterone — go to an endocrinologist, not a supplement store.
4. Pre-workout (caffeine + 15 others)
One active ingredient (caffeine). Price: 150 PLN per container. The same caffeine from tablets: 30 PLN/month. Arginine, taurine, L-carnitine — weak evidence, small doses.
5. ZMA (zinc + magnesium + B6)
Only if you have a deficiency. Most people don't. It's cheaper to buy magnesium separately (malate or citrate) for 20 PLN.
6. Ashwagandha
Trendy. Some studies show an effect on cortisol and sleep, others don't. If you want to try it — KSM-66 standard, not junk. Quality of research: 4 out of 10.
7. Fat burners (CLA, L-carnitine, green coffee extract)
Meta-analysis studies: an effect of 0.5-2 kg in 12 weeks. Without dietary changes = 0 kg. Calories always win.
8. Greens powders (Athletic Greens etc.)
350 PLN/month for a mix of vegetables and vitamins. Simpler and cheaper: 2 vegetables and 1 fruit with every meal + a good multivitamin for 15 PLN.
9. Glucosamine / chondroitin for joints
Cochrane review: "Minimal or no effect" on joint pain and progression of degeneration. Omega-3 and stabilization training do more.
10. Collagen peptides for joints and skin
One serious study (Clark et al., 2008) suggests a minor effect on joint pain, but the sample size was 97 people. Definitely secondary to whey protein. If you eat 30g of protein from various sources — it's enough.
Starter plan (if you have a 150 PLN/month budget)
- Creatine monohydrate — 5g daily (≈10 PLN/month)
- Vitamin D3 — 3000 IU daily (≈7 PLN/month)
- Omega-3 — 2g EPA+DHA daily (≈80 PLN/month)
- Caffeine 200 mg tablets — 1 before a match/important training (≈15 PLN/month)
- Whey 25g x once daily (≈30 PLN/month)
Total: ~142 PLN/month. This is a realistic stack that can give an amateur goalkeeper a +3-5% boost in performance. The rest is diet, sleep, and training.
The match starts with your gloves
Supplements add percentages. But if your gloves slip — you'll see 0% of that. The Invictus X PRO has Contact PRO 4mm latex — full grip on dry grass, in the rain, and on artificial turf.
Check out the Invictus X PRO →Final note: brand purity
The Polish supplement market is poorly regulated. Every 5th Polish supplement product contains different doses than declared (UOKiK study 2022). Buy brands that have certifications: Informed Sport, Cologne List, NSF Certified for Sport. They're 15-20% more expensive, but you know what you're taking.
This is especially important for young players dreaming of a career — some cheap supplements are contaminated with substances on the WADA prohibited list. An accidental 2-year disqualification.
— Wojtek