Why molecular size matters and why 300–500 Dalton is the sweet spot.
When we talk about collagen, we often talk about how much we take. 5 grams. 10 grams. Sometimes even 20 grams. But there is another number worth understanding.
Dalton
Dalton tells us something very different. It tells us about the molecular weight, or simply put, the size of a peptide. And when it comes to collagen, size matters.
What exactly is a Dalton?
A Dalton (Da) is a unit used to measure molecular weight. Collagen is naturally a very large protein. To make collagen peptides, it is broken down into much smaller pieces through a process called hydrolysis. But not all of those pieces are the same size. Some collagen peptides are relatively large and others are much smaller.
The lower the Dalton number, the smaller the peptide. And molecular size can influence how efficiently those peptides are absorbed and how they interact with the body.
Why does size matter?
Before collagen peptides can circulate in the body, they first have to make their way through the digestive system. Research shows that smaller collagen peptide fractions particularly those below 3,000 Da demonstrate greater absorption than larger fractions. This is where tripeptides become particularly interesting.
A tripeptide is exactly what the name suggests:
Three amino acids linked together. These small, precise peptides are already broken down into a specific structure designed for efficient absorption.
But smaller isn't always better.
But smaller isn't always better. It might seem like the smaller the peptide, the better. But there is a limit. If peptides become too small, they break down into individual amino acids and lose their peptide structure. Below approximately 150 Dalton, this peptide-specific activity is lost.
The goal isn't to make collagen as small as possible. It's about finding the sweet spot.
And for tripeptide, that sweet spot is 300–500 Dalton.
The sweet spot: 300–500 Dalton
The tripeptide used in Lady Molecule has an average molecular weight of approximately 300–500 Dalton, with more than 80% collagen tripeptides.
This ultra-low molecular weight falls within the optimal range for absorption and bioactivity.
In simple terms:
Small enough for efficient absorption.
Structured to retain its bioactivity.
This is molecular precision.
THE SWEET SPOT
300–500 DALTON
The graph above illustrates the relationship between molecular weight and bioactivity reported in the referenced research. The 300–500 Da range falls around the peak of the curve, while bioactivity decreases as molecular weight increases.
And importantly, the graph also helps explain why smaller does not simply mean better.
There is an optimal range.
Absorption. Bioavailability. Bioactivity.
Three words that sound similar but mean different things. Absorption is about getting peptides from the digestive system into the body. Bioavailability refers to how available those peptides become after they are consumed. Bioactivity describes their ability to interact with biological systems and produce a biological effect.
This is why the amount of collagen in a scoop doesn't tell you everything.
Molecular size matters.
Peptide structure matters.
Bioavailability matters.
Why we chose tripeptides
At Lady Molecule, we focus on what matters most: precision over excess.
That’s why Beauty Potion N°1 uses marine collagen tripeptides with an ultra-low molecular weight of 300–500 Dalton, created through controlled enzymatic hydrolysis for molecular precision and efficient absorption
Instead of simply asking:
“How many grams of collagen am I taking?”
We think there is another question worth asking:
“What form of collagen am I actually taking?”
Because when it comes to collagen, sometimes the smallest details make the biggest difference.
300–500 DALTON.
Precision at a molecular level.
Less dose. More power.
