In the top-division locker room, I had a teammate who spent 600 zł a month on supplements. Pre-workout at 150 zł, two different protein powders, BCAAs, glutamine, ashwagandha, testosterone boosters, three types of vitamins. He played great — but he also ate well, slept 9 hours, and had good genetics. The supplements probably gave him 2% more than I got from my 120 zł/month stack.
I've learned: supplements are the finish line. The foundations are sleep, food, training. But the cut matters too — 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 matter—and which ones count for 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 effort (jumps, throws) by 10-20%.
Dosage: 3-5g daily, non-stop. No loading phase (old myth). With anything, anytime.
Cost: $40-60 per kilogram (lasts 6-10 months).
Brand: Creapure® (German, certified purity) — e.g., Olimp Creapure, SFD Creapure. Other brands are fine too, as long as it's monohydrate.
2. Caffeine
Class A ergogenic aid per ISSN. Cuts reaction time by 3-5%, improves focus, raises fatigue threshold. Ideal for goalkeepers.
Dosage: 3-6 mg/kg body weight. For 85 kg: 255-510 mg. Start with 200 mg, check tolerance. 60 minutes before match/training.
Source: tablet 200 mg (3 zł/unit) OR 2× strong coffee (≈150 mg each). Caffeine gummies (Run Gum) work faster — 15 min.
Note: not after 2:00 PM if you have an evening match. It'll mess with your post-match sleep and hurt recovery.
3. Vitamin D3
In Poland, 80% of the population has a deficiency (especially October-March when there's no sun). Deficiency = weakened immunity (more infections = missed training), weaker muscles, worse sleep.
Dosage: 2000-4000 IU daily, with a fat-containing meal (it's fat-soluble). Summer: 1000 IU if you're in the sun a lot.
How to tell if you need it: blood test for 25-OH-D3 (60-80 PLN at any lab). Target 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 recovery after matches, reduces DOMS (muscle soreness), improves sleep. For a goalkeeper training 5× per week: solid investment.
Dosage: 2-3g total EPA+DHA daily (note — read the label, "fish oil 1000 mg" is NOT the same; EPA+DHA there is often just 300 mg).
Brand: Norsan Omega-3 Total, Apollo's Hegemony O3, Carlson Super DHA. 80-120 zł for a month's supply.
Alternative: 2 servings of fatty fish (salmon, mackerel, herring) per week = similar effect without supplements.
5. Beta-alanine
Lesser-known but well-researched. Increases muscle carnosine — a buffer against lactic acid buildup. Result: you can hold intensity 1-2 seconds longer (like sprinting for the ball or a long throw-in). Secondary role for a goalkeeper, but it helps where it counts.
Dosage: 3-5g daily, in 2-3 doses (to avoid skin tingling). Minimum 4 weeks to take effect.
Cost: 30-40 PLN/month.
Note: the first dose often causes skin tingling (paresthesia)—harmless but uncomfortable. It passes after a week.
Plus optional: 1 especially for amateurs
6. Whey protein
Technically not a supplement, just 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 (pointless).
Brand: isolate if you're lactose intolerant, concentrate if not. Olimp, Trec, Myprotein — solid Polish brands, 100-150 zł per kilogram.
10 supplements that are just marketing (save your 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. Money down the drain.
2. Glutamine
Marketing from 20 years ago. 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 — see an endocrinologist, not a supplement shop.
4. Pre-workout (caffeine + 15 others)
One active ingredient (caffeine). Price 150 zł per package. Same caffeine from tablets: 30 zł/month. Arginine, taurine, L-carnitine — weak evidence, lots of filler.
5. ZMA (zinc + magnesium + B6)
Only if you're deficient. Most people aren't. Cheaper to buy magnesium separately (malate or citrate) for 20 zł.
6. Ashwagandha
Trendy. Some research shows an effect on cortisol and sleep, others don't. 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-analytic research: effect of 0.5–2 kg in 12 weeks. No diet changes = 0 kg. Calories always win.
8. Greens powders (Athletic Greens etc.)
350 zł/month for a veggie and vitamin blend. Simpler and cheaper: 2 veggies and 1 fruit in every meal + a solid multivitamin for 15 zł.
9. Glucosamine / chondroitin for joint support
Cochrane review: "Minimal or no effect" on joint pain and osteoarthritis progression. Omega-3 and stability training do more.
10. Collagen peptides for joints and skin
One solid study (Clark et al., 2008) suggests a minor effect on joint pain, but the sample was only 97 people. Definitely secondary to protein intake. If you're eating 30g protein from varied sources—you're covered.
Starter plan (if you have a 150 PLN/month budget)
- Creatine monohydrate — 5g daily (≈10 zł/month)
- Vitamin D3 — 3000 IU daily (≈7 zł/month)
- Omega-3 — 2g EPA+DHA daily (≈80 zł/month)
- Caffeine tablet 200 mg—1 before match/important training (≈15 zł/month)
- Whey 25g once daily (≈30 PLN/month)
Total: ~142 zł/month. This is a realistic setup that can give a +3-5% boost to an amateur keeper's performance. The rest is diet, sleep, training.
The match starts with your gloves
Supplements add percentages. But if your gloves slip—you'll see 0% of it. Invictus X PRO has Contact PRO 4mm—full grip on dry grass, rain, artificial turf.
See Invictus X PRO →Final note: brand integrity
The Polish supplement market is poorly regulated. One in five Polish supplement products contains different doses than declared (UOKiK research 2022). Buy brands with certifications: Informed Sport, Cologne List, NSF Certified for Sport. They cost 15-20% more, but you know what you're getting.
Critical for young players dreaming of a career — some cheap supplements are contaminated with substances on the WADA banned list. Accidental disqualification for 2 years.
— Wojtek