7 Reasons Lifters Who Actually Read The Studies Are Switching To DL185.
For decades, leucine has been the muscle-building amino acid every serious lifter loaded up on. The problem: most of it never makes it to your muscles. Researchers have known for years that free-form leucine hits an absorption ceiling — and a new dipeptide form, DL185, is the first ingredient with peer-reviewed human data showing it gets past that ceiling. Here's what's in three published trials, and why lifters who actually read them are switching.
Reason 01
1. The Leucine Ceiling Is Real. Doubling Your Dose Doesn't Double Your Results.
Free-form leucine is absorbed via amino acid transporters that get congested every time you eat protein or take BCAAs. Past a certain dose, the door doesn't open wider — additional leucine just gets stuck in queue and excreted unused.
This is why every lifter past the beginner phase eventually plateaus on leucine. You can stack more BCAAs, more EAAs, more protein — and the actual amount of leucine reaching your muscle cells barely changes. The transporter is full.
Reason 02
2. DL185 Is A Dipeptide. It Uses A Transporter Free Aminos Can't Access.
DL185 pairs two leucine molecules in a single dipeptide bond. That bond survives digestion — and the resulting molecule is absorbed via an entirely separate intestinal channel called PepT1.
PepT1 is dedicated to intact dipeptides. Free amino acids can't use it. Which means DL185 bypasses the congested free-amino slots completely. No competition. No queue. More gets through, faster.
Reason 03
3. 159% More Muscle Protein Synthesis. Same 2g Dose. Published.
In a controlled human trial, the same 2,000mg dose of leucine in dipeptide form (DL185) triggered 159% more muscle protein synthesis vs baseline — and 60% more than the same dose of regular free-form leucine.
The mechanism: more leucine arrives intact, in higher concentration, and the mTOR signal it triggers is correspondingly stronger. Same dose. More signal. More gets built.
Paulussen et al., Journal of Applied Physiology, 2021. Independent — not funded by the ingredient manufacturer.
Reason 04
4. 220% More Reps To Failure. In Resistance-Trained Athletes.
An independent 2024 trial put DL185 head-to-head with regular leucine in trained lifters and measured leg-press reps to failure. The DL185 group hit 220% more reps — over twice the volume per session at the same weight.
More volume means more stimulus delivered. More stimulus delivered means more growth triggered. The compound effect over weeks of training is the entire point.
Hagele et al., PLOS ONE, 2024. Resistance-trained athletes, controlled human trial.
Reason 05
5. One Ingredient. 2,000mg. Zero Filler.
The entire supplement panel is one line: L-leucyl-L-leucine monohydrate, 2,000mg per 3-capsule serve. No proprietary blends. No artificial colours. No flavourings. No magnesium stearate. The capsule shell is plant-based HPMC.
If you've ever flipped a tub of "performance aminos" and tried to figure out how much leucine you're actually getting under a "5,000mg Anabolic Matrix™" label — this is the opposite of that.
Reason 06
6. $4.82 Per Training Session. Less Than A Coffee.
At $134.95 for 28 servings, DL185 works out to $4.82 per session. For most lifters that's a fraction of what they're already spending on BCAAs ($50–60/mo) plus free leucine ($25/mo) — and DL185 outperforms both on a peer-reviewed basis.
You're not adding another tub to the shelf. You're replacing the leucine you're already paying for, with the version that actually gets to your muscles.
Reason 07
7. Patented NNB Ingredient. NZ-Manufactured. 60-Day Money Back.
DL185® is a patented dileucine ingredient developed by NNB Nutrition — the same ingredient innovator behind several premium sports nutrition brands globally. Athletech sources it direct, so you get the genuine article (not a knockoff dileucine sold under a similar name).
Manufactured in New Zealand. Packed at a single facility, single batch, third-party tested. 60-day money-back guarantee on every order — fewer than 1% of customers ask for a refund. The only way you lose is by never trying it.
Athletech DL185 Peptide Muscle Accelerant 84 Caps
28 servings · 84 capsules · 2,000mg dileucine per serve. Take 30 min pre-training. Stacks with everything.
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Ingredient Provenance
DL185® Is Developed By NNB Nutrition. Athletech Sources It Direct.
NNB Nutrition is a specialist ingredient innovator with a global supply chain serving premium sports-nutrition brands across the US, EU, and Asia. Their dileucine peptide is the only one in the market with three independently published human trials behind it. Athletech sources DL185 direct from NNB to ensure authenticity and full-strength dosing — no relabelled knockoffs, no diluted blends, no "DL-brand" copycats.
Patented
L-leucyl-L-leucine monohydrate — protected dipeptide form
3 Studies
Independent peer-reviewed human trials backing efficacy
Direct-Sourced
Athletech buys NNB-original — no third-party knockoffs
Peer-Reviewed Human Trials
Three Independent Studies. None Funded By The Ingredient Manufacturer.
+159%
More muscle protein synthesis vs baseline. 60% more than free leucine at the same 2g dose.
Paulussen et al., Journal of Applied Physiology, 2021.
+220%
More leg-press reps to failure vs free leucine. Resistance-trained athletes, controlled trial.
Hagele et al., PLOS ONE, 2024.
+185%
Faster plasma leucine appearance. Dipeptide form absorbs faster, in higher concentration.
Paulussen et al., Journal of Applied Physiology, 2021.
The Leucine You're Already Paying For Is Hitting A Ceiling You Can't See.
DL185 is the first ingredient with three independent human trials showing it gets past that ceiling. Same 2g dose. 159% more MPS. 220% more reps. One ingredient, zero filler, 60-day money-back guarantee.
Try DL185 →
DL185 Peptide Muscle Accelerant