Search any coupon aggregator and you'll see Growth Guys "codes" for 20%, 25%, even 35%. Here's what most people get wrong: they pick the biggest number and get rejected at checkout. Those codes weren't issued by the store — they're auto-generated by the coupon site to win your click. The right question isn't "which code is biggest," it's "which code can prove it works."
| Code | Rate | Proof it works | Verdict |
|---|---|---|---|
| HEALTHYLIFE10 | 10% | Dated cart test + monthly public log | ✅ Best — most-documented |
| CANADA | 10% | Dated cart test, same log | ✅ Equal — easiest to remember |
| PEPTIDES | 10% | Dated cart test, same log | ✅ Equal |
| SST10 / SAVE10 / Gpeps | 10% | Other affiliates' codes, same rate, not tested here | Works, unverified by us |
| TRIPLE20 / GIMME10 / WB20 / 25-35% codes | "20-35%" | No issuer, no date, no math | ❌ Fails checkout |
Notice the pattern: the top three are the ones with published evidence. That's the whole ranking — not the discount size, which is identical, but the proof.
Each of the three codes is applied to a real cart at growthguys.com on a schedule and the exact discount is recorded — passes and failures alike — in a public verification log. That's the difference between this page and a coupon aggregator: our tests have confirmed the flat 10% on carts from $5 to $430 CAD, with receipts. A "best code" claim that can't show a dated cart isn't a verdict; it's an ad.
Whichever you'll remember — they're interchangeable at 10%. If you're on the Canadian store, CANADA is the easy one; peptide buyers like PEPTIDES; HEALTHYLIFE10 is the original and most widely recognized. Full list with live test dates: every code that actually works.
What is the best Growth Guys promo code? There is no single best by discount — HEALTHYLIFE10, CANADA, and PEPTIDES all give a flat 10% and are cart-tested monthly. "Best" means verified, and those three are.
Is a 20% or 30% code better? No — no code above 10% has passed a real checkout test. Larger numbers on coupon sites are generated, not issued, and are rejected at checkout.
Which code should I use in Canada? Any of the three; CANADA is the easiest to remember on the Canadian store. All apply the same 10%.
How do I know these are actually tested? Every automated cart test — pass or fail — is published with its date and math in our public verification log.
For research and educational purposes only. Not medical advice.