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YOGHSKIN
You open a collagen cream, apply it, and your skin feels soft and firm. It seems like it works, right?
But… not quite.
Or rather: something is working, but not the thing you’re paying for. The difference matters — and it’s worth understanding.
The skin does not have the ability to absorb everything it comes into contact with. Quite the opposite: its primary biological function is to act as a protective barrier that prevents substances — including pathogenic microorganisms, pathogens, and toxins — from entering the body.
And our skin does this exceptionally well.
But if you want to know whether a certain ingredient can penetrate deeply enough to produce a real effect — even something as radical as reversing an already established biological process — one parameter is decisive: molecular weight.
In 2000, researchers Bos and Meinardi published a systematic review in Experimental Dermatology examining all chemical compounds documented to penetrate the skin. Their conclusion: molecules weighing more than 500 Daltons (Da) do not penetrate the dermis in quantities sufficient to produce a biological effect.
Five hundred Daltons is, roughly speaking, the upper limit for penetration.
The molecular weight of collagen is around 300,000 Da. Yes — 300,000. Six hundred times above the threshold.
This is where things get a bit more interesting.
The cosmetics industry and beauty brands understand the physics, which is why many of them do not use “pure” collagen, but hydrolyzed collagen — meaning collagen that has been enzymatically broken down into smaller peptide fragments. Typical hydrolyzed collagen peptides have a molecular weight between 2,000 and 10,000 Da. Significantly smaller than 300,000, but still far above the 500 Da threshold.
There are also even smaller collagen tripeptides, under 1,000 Da. Some of these have demonstrated limited penetration into the epidermis. However, this introduces a second problem: penetrating the epidermis is not the same as reaching the fibroblasts in the dermis — the cells that actually produce collagen. The physical distance between the two layers is small, but biologically, it is enormous.”
It does something — just not the thing promised on the packaging.
Hydrolyzed collagen peptides are excellent humectants. Humectants are well-studied substances (glycerin is the most common humectant, along with hyaluronic acid) that attract water to the surface of the skin and temporarily improve its appearance. The feeling of firmness and softness is real. It’s simply not caused by reconstruction of the dermis, but by surface-level moisture retention.
So if you’re buying a collagen cream for hydration, you’ll probably get hydration — just at a higher price than necessary. If you’re buying it because you believe it “replenishes” collagen in the skin, you won’t get what’s being promised. Science simply cannot confirm such a claim.
Because it works as marketing.
“Collagen” is a word people instantly associate with youth and elasticity. And while EU regulations (Regulation No. 1223/2009) require cosmetics to be safe and prohibit medical claims, they do not require brands to prove the biological mechanism behind a product.
The space between a “cosmetic promise” and a “proven clinical effect” is quite wide.
And that’s exactly where most of the collagen skincare market lives.
This is where the science becomes much more specific — and much more interesting.
Ingredients with genuinely documented effects tend to share one characteristic: low molecular weight — low enough to penetrate where they actually need to go.
Retinol (vitamin A) has a molecular weight of 286 Da, comfortably below the 500 Da threshold. A study from the University of Michigan Medical School, published in the International Journal of Cosmetic Science, showed that topical application of retinol on naturally aged skin stimulates collagen synthesis and activates dermal fibroblasts The mechanism is documented.
Ascorbic acid (vitamin C, 176 Da) acts as an essential cofactor in collagen biosynthesis. In a stable form and at sufficient concentration, topical application has demonstrated clinically measurable effects.
Sunscreen works differently: preventively. Ultraviolet radiation is the primary factor accelerating collagen breakdown in the dermis by activating enzymes called matrix metalloproteinases. Preventing the damage is significantly more effective than trying to reverse it afterward.
The logic is consistent: the ingredients backed by real evidence are small molecules with sufficient concentration and stability. In this case, size matters.
YOGH does not sell collagen products. Not because collagen is unpopular, but because we do not make promises unsupported by independent science.
Every ingredient in our products is there for a specific function and benefit for the skin or hair — not simply to fill the formula. If we cannot justify it, we do not include it.”
