Peptides, Part Two: Argireline and Tripeptide-29

Argireline NP, Argireline YOUth and Tripeptide-29 — the three peptides on my own shelf, and why each one earns its place.

Part One covered the signal peptide pair that tells skin to build. This part covers the three I reach for next. They are not a second dose of the same message: one works on the look of expression lines, one is a collagen-type fragment used at a very low rate, and one is the only peptide I know of that dissolves in an oil-only balm.

That difference is the whole reason to own more than one. Two peptides working through separate pathways give you more than two doses of one.

At a glance

Argireline NP: the expression-line peptide

Argireline NP is acetyl hexapeptide-8 in a water-based solution. It works on a different route from the signal peptides: rather than asking skin to build, it is used to soften the look of the lines that come from movement — around the eyes, across the forehead.

The supplier's range is 2 – 10% of the solution, added at cool down. The guides use it at 3% in the bakuchiol face whip and 5% in the eye cream, where expression lines are the whole brief.

Argireline YOUth: the one that goes in a balm

Most peptides are water-soluble, which shuts them out of anything anhydrous. Argireline YOUth is the same acetyl hexapeptide-8, carried in an oil-soluble system, so it disperses in a balm or an oil serum with no water phase at all.

It is used at 0.8 – 2%, stirred in below 55 °C with the antioxidants rather than into the hot melt. The overnight renewal balm in Balm It Up uses the full 2%, which is how a balm ends up carrying a peptide.

Tripeptide-29: small rate, collagen-type fragment

Tripeptide-29 is a short collagen-type peptide built from glycine, proline and hydroxyproline — the amino acids collagen is richest in. It is used at a fraction of the rate of the others, 0.1 – 1%, which makes it one of the cheapest peptides per batch.

It is stable from about pH 4 to 7 and belongs in the water phase at cool down. The guides use it at 1% in two serums, including the copper-peptide serum, where it adds a second peptide without adding a chelator that would strip the copper.

How they stack

Any single signaling route saturates. Once skin has heard a message as loudly as that receptor can hear it, more of the same peptide changes nothing — you are paying for a message already received.

So the useful move is to combine peptides that work differently: a signal peptide blend at 4% with Argireline NP at 3 – 5%, or Tripeptide-29 at 1% alongside either. It is the same logic as stacking humectants rather than doubling the glycerin.

As with every peptide, the rate refers to the supplier's solution, not to pure peptide. Check the technical sheet for the product you actually bought before assuming a rate transfers.

Is it worth the money

Honestly: peptides are the ingredient where the gap between price and demonstrated effect is widest. They work, slowly and modestly, and they are the most expensive thing in most serums.

The reason to make your own is precisely this. A peptide serum at the counter costs sixty to a hundred dollars for thirty milliliters. The same peptides, at the same rates, made at home, cost a few dollars a bottle. Refrigerate the solutions once opened — cold storage costs nothing.

Where they show up in the guides

These ingredients appear in 5 of the formulations across the catalogue, at these rates:

Keep reading

• Peptides, Part One: The Signal Peptides
• Copper Peptide (GHK-Cu)
• Bakuchiol

Duplika Beauty · duplikabeauty.co · This is formulation information, not medical advice. Patch test anything new.