DL185 - the muscle-building peptide for naturals!
The molecule itself differs fundamentally from conventional L-leucine: DL185 consists of two covalently bonded leucine molecules, which exist as a dipeptide — i.e., as dileucine. This seemingly small structural change has far-reaching consequences for absorption, bioavailability, and ultimately for the effects of DL185 in muscle tissue.
L-Leucine has been known for decades as the crucial branched-chain amino acid for muscle protein synthesis. In practice, however, a known problem arises: the absorption capacity for free amino acids in the intestine is limited and subject to saturation mechanisms. DL185 bypasses this limitation due to its peptide structure — a decisive advantage over the classic single amino acid.
NNB Nutrition, as the innovator behind the patent, has developed DL185 as a patented dileucine peptide specifically designed for an improved anabolic response. The company is known in the supplement industry for its scientifically sound proprietary developments — and DL185 is a particularly well-documented example.
The following section shows what exactly is behind the superior absorption speed and which transport mechanism is responsible for it.
The PEPT1 advantage: Why DL185 is absorbed 185% faster
DL185 does not reach the musculature despite its dipeptide structure — but precisely because of it. The decisive difference lies in a specialized transport mechanism in the small intestine: the PEPT1 transporter.
The PEPT1 transporter is evolutionarily optimized for di- and tripeptides — i.e., for short amino acid chains, not for individual free amino acids. While standard leucine relies on classic amino acid transporters that are easily saturated and compete with each other at high dosages, DL185 uses this separate, significantly more efficient channel. The result: an absorption rate 185% faster compared to conventional leucine.
How does DL185 influence muscle building? What is the evidence-based proof of its effect?
Dileucine increases muscle protein synthesis (MPS) 42% more effectively than conventional leucine at the same dosage.
“The 2021 Paulussen study provides the decisive scientific evidence for the superior effect of DL185: In a randomized, double-blind study, the anabolic response of 2 g of dileucine was compared with 2 g of free L-leucine. The result was clear: Despite identical dosages, the dileucine peptide activated muscle protein synthesis (MPS) 42% more strongly than the single amino acid.
The deciding factor for these dileucine benefits lies in the intracellular signaling rate. While conventional leucine often reaches rapid transporter saturation, the peptide bond in DL185 appears to allow for more efficient and potentially longer-lasting signal transmission to the mTORC1 complex — the primary regulator of muscle growth. For athletes, this means that patented dileucine not only works faster, but also triggers the body’s anabolic machinery much more massively, even with a lower total quantity.”
Source: Journal of Applied Physiology (Paulussen et al., 2021)
Here is an overview of the key aspects of the DL185 effect and the associated dileucine benefits:
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Maximum absorption speed: By utilizing the high-capacity PEPT1 transporter in the small intestine, DL185 is absorbed about 185% faster than conventional L-leucine.
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Significantly higher muscle protein synthesis: Studies show that this patented dileucine stimulates muscle protein synthesis 42% more strongly than the same dosage of free amino acids.
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Superior bioavailability: The covalent dipeptide structure prevents premature saturation of standard amino acid transporters, allowing more active ingredient to effectively reach the muscle tissue.
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Optimized anabolic signaling: The patented dileucine effect targets the mTORC1 complex directly, resulting in more efficient activation of muscle-building processes — even at a lower total dosage.
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Scientifically sound innovation: Developed as a modern dipeptide, DL185 represents the next evolutionary step in amino acid supplementation, going far beyond the potential of classic leucine.
Target group: Who benefits most from the DL185 effect? Suitable for beginners and advanced users alike?
Although DL185 is fundamentally suitable for every trainee due to its high safety profile and biological relationship to natural amino acids, its use should be strategic.
Beginners: A solid foundation before high-end optimization
Beginners in strength training are in a physiologically privileged position — the so-called “newbie gains.” In the first 6 to 12 months, the body reacts so sensitively to training stimuli that muscle protein synthesis is already maximally stimulated by a moderate protein intake and conventional L-leucine.
Although beginners could benefit from dileucine benefits, the additional gain compared to standard supplements is often marginal, as the body's own adaptation processes are already running at full speed. For this group, DL185 is an option, but not a necessity.
Advanced athletes: The tool for overcoming plateaus
Our clear recommendation is therefore primarily for advanced athletes. Anyone who has been training for years will inevitably reach a limit where progress can only be achieved through minor optimizations. This is where patented dileucine shows its full strength:
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Breaking through stagnation: When standard nutrition is no longer enough to set new anabolic stimuli, the 42% stronger MPS activation can make the decisive difference.
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Efficiency at high volumes: Advanced users often have a higher demand for amino acids. By using the PEPT1 transporter, the digestive system is relieved, as absorption runs significantly faster and more efficiently than with massive amounts of free amino acids.
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Competition preparation and deficit phases: Especially in calorie-reduced phases, it is essential that every gram of protein is utilized optimally. The patented dileucine effect helps to keep the anabolic signaling chain stable even with lower energy intake.
In summary: While beginners build well with the basics, DL185 is a true precision tool for the advanced athlete to get the maximum out of their genetic predisposition.
Conclusion on DL185: DL185 effect and advantages over conventional leucine
DL185 is more than just a further development of L-leucine; it represents a technological leap in sports nutrition. By utilizing the highly efficient PEPT1 transporter and the associated 185% faster absorption, patented dileucine offers a decisive strategic advantage.
In summary, the dileucine benefits can be reduced to three core points: bypassing classic saturation limits, massively accelerated bioavailability, and a significantly stronger DL185 effect on muscle protein synthesis. For athletes who want to maximize their anabolic response, this dipeptide marks the end of the era of simple amino acid supplements.