Supplements fighters actually use in 2026
The supplement industry talks to fighters like we are stupid and rich. We are sometimes one of those. Here is the short list I will spend money on, and the pile I will not.
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Key takeaways
- Creatine monohydrate is still the one worth buying first.
- Whey is food insurance, not a personality.
- Caffeine works. Stacking five pre-workouts does not.
- Tested athletes: NSF Certified for Sport, or skip it.
- Peptides, SARMs, and "research chems" are a different article, and a different risk.
Creatine monohydrate
Five grams a day. Drink water. Ignore loading phases unless you like GI issues. Look for Creapure or a brand that publishes a lot number. I do not cycle it. The ISSN creatine position stand is the paper people wave around if you want to read something denser than a label.
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Buy on Amazon
- Creatine: Nutricost Creapure 500g
- Whey: Optimum Nutrition Gold Standard whey
- Jump rope backup: Lightweight speed rope
Whey or a mixed protein
I use whey when I am between meals. If dairy wrecks you, use a mixed plant or isolate. Protein powder does not build a fighter. It stops you from skipping food after a second session.
Electrolytes
Sodium, potassium, some flavor so you drink it. I do not care which pouch is trending this month. If it tastes like perfume I will not use it. If you are in a hard cut, your coach owns the sodium plan, not a sachet brand.
Caffeine
Coffee or a simple caffeine pill. I cut it after early afternoon or I will not sleep. Sleep is a better performance drug than any pre-workout with a skull on it.
Omega-3 and vitamin D
I take both because bloodwork said I should, not because a podcast did. Get labs. Do not mega-dose.
Beta-alanine
The tingle is real. The benefit for repeated hard rounds is modest. I use it sometimes in camp. I would not skip creatine to afford it.
What is trending that I will not recommend
SARMs. Unapproved peptides sold as recovery. Fat burners with a dozen stimulants. Anything that says "not for human consumption" on the same page it tells you how to inject it. If you compete, read the FDA peptide rules before you let a clinic bro sell you a vial.
If you want third-party tested tubs
Look for NSF Certified for Sport or Informed Sport. Momentous and a few others play in that lane. I still cannot drop an affiliate URL for them until the brand approves King Killers. Apply links live in our ops notes, not on this page.
Train in kit that survives camp
If you are already in camp, skip the fashion drop and grab the Fight Camp Kit or dry-fit rash guards. Free USA shipping over $100. 30-day returns.
Questions I get
Will creatine make me miss weight?
It can add a little water. Talk to your cut coach. Most people still use it until late camp.
Can I take a pre-workout instead of eating?
No.
What if I am drug tested?
Food first. NSF-certified basics. Nothing from a Telegram vendor.
About the author
Michael Heckert is a BKFC middleweight and the founder of King Killers. He trains in the Tampa Bay area. This is gym talk, not medical advice. Check anything that goes in your body with a doctor who actually knows combat sports, and check banned-substance lists before fight camp.
Disclosure: King Killers products linked here are our own. This is not medical, legal, or anti-doping advice.