In the Ekstraklasa locker room, I had a teammate who spent 600 EUR monthly on supplements. Pre-workout for 150 EUR, 2 different protein powders, BCAA, glutamine, ashwagandha, testosterone boosters, 3 types of vitamins. He played brilliantly — but he also ate well, slept 9 hours, and had good genetics. Supplements probably gave him 2% more than they gave me with my 120 EUR/month set.
I've learned: supplements are the last step. The foundations are sleep, food, training. But the tip also matters — if you know what works and don't fall for the rest.
5 supplements with evidence (ISSN position stand)
International Society of Sports Nutrition (ISSN) publishes a 'position stand' every 5 years — a document stating which supplements have evidence „strong evidence of effectiveness and safety". Here are 5 that are there — and that matter to a goalkeeper.
1. Creatine monohydrate
The most researched supplement in sports history. Over 500 studies, over 95% show effectiveness. For goalkeepers: increases muscle power by 5-15%, capacity for short explosive efforts (jumps, throws) by 10-20%.
Dosage: 3-5g daily, non-stop. No loading phase (old myth). With anything, at any time.
Cost: 40-60 EUR per kilogram (lasts 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
Class A ergogenic aid according to ISSN. Shortens reaction time by 3-5%, improves concentration, raises fatigue threshold. Ideal for a goalkeeper.
Dosage: 3-6 mg/kg body weight. For 85 kg: 255-510 mg. Start with 200 mg, check tolerance. 60 minutes before a match/training.
Source: 200 mg tablet (3 EUR/piece) OR 2× strong coffee (≈150 mg each). Caffeine gums (Run Gum) work faster — 15 min.
Note: not after 2 PM if the match is in the evening. It will disrupt your post-match sleep and hinder recovery.
3. Vitamin D3
In Poland, 80% of the population has a deficiency (especially October-March, when there is no sun). Deficiency = weakened immunity (more infections = lost training sessions), weaker muscles, poorer sleep.
Dosage: 2000-4000 IU daily, with a fatty meal (it's fat-soluble). Summer: 1000 IU if you spend a lot of time in the sun.
How to check if you need it: 25-OH-D3 blood test (60-80 EUR in any lab). Target 40-60 ng/ml. Below 30 = supplement, above 70 = excess.
Cost: 30-40 EUR 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.
Dosage: 2-3g total EPA+DHA daily (note — read the label, this is NOT the same as “oil of fish 1000 mg”, where EPA+DHA is often only 300 mg).
Brand: Norsan Omega-3 Total, Apollo's Hegemony O3, Carlson Super DHA. 80-120 EUR for a monthly 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. Effect: you can last 1-2 seconds longer at high intensity (e.g., sprinting for the ball, a long throw-in). For a goalkeeper, its role is secondary, but if applicable, it helps.
Dosage: 3-5g daily, in 2-3 doses (to avoid skin tingling). Minimum 4 weeks to take effect.
Cost: 30-40 EUR/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 struggle to eat 140g of protein daily from food — whey fills the gap.
Dosage: 25-35g after training OR as a supplement during the day. No more than 50g/day (it makes no sense).
Brand: isolate if you have lactose intolerance, concentrate if not. Olimp, Trec, Myprotein — solid Polish brands, 100-150 EUR/kilogram.
10 supplements that are marketing hype (save money)
1. BCAA (branched-chain amino acids)
If you eat 1.6g protein/kg/day — BCAAs are redundant. Research from the last 5 years has debunked their popularity. Wasted money.
2. Glutamine
Marketing from 20 years ago. The only confirmed effect: helps wound healing after surgeries. For a goalkeeper — nothing.
3. Testosterone boosters (Tribulus, D-Aspartic acid)
They do not raise testosterone in men with normal levels. If you have low testosterone — consult an endocrinologist, not a supplement store.
4. Pre-workout (caffeine + 15 others)
One active ingredient (caffeine). Price 150 EUR per pack. The same caffeine from tablets: 30 EUR/month. Arginine, taurine, L-carnitine — weak evidence, high cost.
5. ZMA (zinc + magnesium + B6)
Only if you have a deficit. Most people don't. It's cheaper to buy magnesium separately (malate or citrate) for 20 EUR.
6. Ashwagandha
Trendy. Some studies show an effect on cortisol and sleep, others do not. If you want it — KSM-66 standard, not junk. 4 out of 10 research quality.
7. Fat burners (CLA, L-carnitine, green coffee extract)
Meta-analysis studies: 0.5-2 kg effect in 12 weeks. No dietary changes = 0 kg. Calories always win.
8. Greens powders (Athletic Greens etc.)
350 EUR/month for a vegetable and vitamin blend. Simpler and cheaper: 2 vegetables and 1 fruit with each meal + a good multivitamin for 15 EUR.
9. Glucosamine / chondroitin for joints
Cochrane review: "Minimal or no effect" on joint pain and degeneration progression. 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 with a sample of 97 people. Definitely secondary to protein intake. If you consume 30g of protein from various sources — that's enough.
Starting plan (if you have a 150 EUR/month budget)
- Creatine monohydrate — 5g daily (≈10 EUR/month)
- Vitamin D3 — 3000 IU daily (≈7 EUR/month)
- Omega-3 — 2g EPA+DHA daily (≈80 EUR/month)
- Caffeine tablets 200 mg — 1 before a match/important training session (≈15 EUR/month)
- Whey 25g x once daily (≈30 EUR/month)
Total: ~142 EUR/month. This is a realistic set that can add +3-5% to an amateur goalkeeper's performance. The rest is diet, sleep, training.
The match starts with the gloves
Supplements add percentages. But if your gloves slip — you'll see 0% of that. Invictus X PRO features Contact PRO 4mm — full grip on dry grass, in rain, and on artificial turf.
See Invictus X PRO →Final note: brand integrity
The Polish supplement market is poorly regulated. Every 5th Polish supplement product contains different dosages than declared (UOKiK 2022 studies). Buy brands that have certifications: Informed Sport, Cologne List, NSF Certified for Sport. 15-20% more expensive, but you know what you're taking.
Especially important for young players dreaming of a career — some cheap supplements are contaminated with WADA-listed doping substances. Unintentional 2-year disqualification.
— Wojtek