Collagen has become one of those things everyone claims to understand.
It appears in powders, gummies, lattes, skincare jars, and the morning routines of people who wake up suspiciously serene.
And yet, most conversations about collagen miss the only question that actually matters:
Can your body use it?
Because collagen doesn’t work simply because it exists.
It works only if your body can absorb it.
That single fact changes everything.
And it brings us to a small, precise measurement with an outsized impact: Dalton size.
Why Collagen Matters (And Why It Stops Showing Up on Its Own)
Collagen is not glamorous. It doesn’t sparkle or energise or promise instant results. It simply holds things together.
Skin firmness. Joint movement. Bone strength. Gut lining integrity. Collagen is the structural protein responsible for all of it, quietly, efficiently, without asking for attention.
But like most good systems, it slows with age.
The body produces less. Recovery takes longer. Skin behaves differently. Joints complain more often than they used to.
Supplementing collagen can help support natural production but only if the form you consume is one your body recognises as useful.
Which brings us to peptide size.
Dalton Size: The Detail That Decides Whether Collagen Works
Collagen supplements are made of collagen peptides, short chains of amino acids broken down from whole collagen.
Dalton size simply measures how large those peptide chains are.
And size matters because your gut is selective.
Smaller peptides pass through the intestinal barrier with ease. Larger ones do not.
Research consistently shows that collagen peptides around 2,000 Daltons (Da) are absorbed efficiently and remain bioactive in the bloodstream.
At this size, peptides:
• pass through the gut barrier smoothly
• are recognised and utilised by the body
• retain functional amino acid sequences
• are gentle on digestion
Once peptides exceed roughly 5,000 Da, absorption drops significantly.
Not because the collagen is bad, but because the body cannot use it effectively.
This is why peptide size isn’t a marketing detail. It’s the difference between intake and impact.
Why 2,000 Dalton Collagen Performs Better
Imagine your digestive system as a doorway.
Small peptides walk straight through.
Oversized ones pause. Struggle. Sometimes never make it.
Collagen peptides at 2,000 Da pass quickly and efficiently, which means:
• faster absorption
• better bioavailability
• more reliable support for skin, joints, bones, and connective tissue
It’s not about consuming more collagen.
It’s about consuming collagen your body doesn’t need to argue with.
This is why people often notice results sooner with smaller peptides, the body isn’t busy breaking them down. It’s already using them.
Why Source and Quality Matter Just as Much as Size
Even the perfect Dalton size means little if the collagen itself lacks quality.
LUNJ FitGlo®uses MSC-certified wild cod from the North Atlantic, chosen for purity, sustainability, and natural bioavailability.
This matters because:
• Marine collagen is generally absorbed more easily than bovine sources
• Wild-caught cod is naturally low in contaminants
• It provides Type I collagen, the primary collagen found in skin, bones, and connective tissue
• The body instinctively recognises its structure
The result is a collagen that dissolves cleanly, tastes neutral, and delivers only what the body needs, nothing extra, nothing unnecessary.
References
Watanabe-Kamiyama M, Shimizu M, Kamiyama S, et al. Absorption and effectiveness of orally administered low molecular weight collagen hydrolysate in humans. Journal of Agricultural and Food Chemistry.
🔗 https://pubmed.ncbi.nlm.nih.gov/23949208/
Sibilla S, Godfrey M, Brewer S, et al. An overview of the beneficial effects of hydrolysed collagen as a nutraceutical on skin properties. Open Nutraceuticals Journal.
🔗 https://benthamopen.com/contents/pdf/TONUTRAJ/TONUTRAJ-8-29.pdf
