Get to know two specialist peptide ingredients appearing in muscle-focused supplements: PeptiStrong® and DL-185™ dileucine.
What are PeptiStrong and dileucine?
Peptides are short chains of amino acids. Your body encounters peptides when it digests dietary protein, but specialist supplements select particular peptide ingredients for a more focused purpose. PeptiStrong and dileucine belong in this category, although their composition is different.
PeptiStrong® is a branded protein hydrolysate derived from fava beans, also called broad beans or Vicia faba. Hydrolysis breaks protein into smaller fragments. The ingredient contains a network of peptides selected for research around muscle function and recovery.
Dileucine, also written as L-leucyl-L-leucine, consists of two leucine molecules joined together. Leucine is one of the essential amino acids and a BCAA. DL-185™ is the branded dileucine ingredient used in the products featured here.
How do the formulas differ?
SNS Pepti-Bolic combines the fava-bean hydrolysate with dileucine. CEL MPC-185 concentrates on dileucine as its headline active. That gives customers a practical choice between a paired peptide formula and a more focused approach.
A combined formula is convenient if you specifically want both ingredients. A focused formula makes it easier to understand which ingredient you are adding to your existing routine. Neither approach removes the need for adequate food and a progressive training programme.
What does the research explore?
A 2023 controlled study of the fava-bean hydrolysate reported improvements in strength recovery and fatigue following a demanding exercise session. A separate immobilisation study found differences in muscle protein synthesis during recovery, without a clear advantage in the changes in muscle size over milk protein. These are different questions, so their findings should be kept in context.
A 10-week controlled dileucine study published in 2024 reported advantages in selected lower-body strength and performance measures during resistance training. This is encouraging ingredient research, rather than a guarantee of the same improvement for every user or proof that combining ingredients produces a bigger effect.
How does it fit alongside protein?
Protein foods and powders supply the amino acids needed across the day. A specialist peptide formula is a different addition: its small serving should not be treated as a replacement for a protein-rich meal or your usual shake.
Start by setting a realistic training schedule, eating enough protein and allowing recovery between sessions. If you add a peptide supplement, follow its current directions and track meaningful outcomes such as repetitions, training loads and recovery over several weeks. Avoid changing several products at once if you want to understand your own response.
Quick comparison
Ingredient
Origin or structure
Featured product
PeptiStrong
Hydrolysed fava-bean protein
SNS Pepti-Bolic
DL-185 dileucine
Two linked leucine molecules
SNS Pepti-Bolic and CEL MPC-185
Frequently asked questions
Is PeptiStrong the same as pea protein?
No. PeptiStrong is a specific fava-bean protein hydrolysate. Pea protein is a different ingredient commonly used as a dietary protein source.
Is dileucine a BCAA blend?
No. It is a dipeptide formed from leucine. A BCAA blend usually supplies leucine, isoleucine and valine.
Can these replace my protein shake?
Treat them as specialist additions. Meals and protein shakes are the practical tools for meeting your daily protein needs.
Explore the featured supplements
See the current ingredients, serving directions and suitability information before choosing.
General information for adults. Check product labels and allergens. Seek qualified advice about suitability if you have a medical condition, take medication, are pregnant or breastfeeding. Check ingredient and allergen information if you react to legumes or other food proteins.
