Profhilo: How It Works, the Evidence, and Who It Suits

Profhilo is one of the most booked injectables in the country and one of the least understood. It gets called a filler, a facial, an injectable moisturiser, and it is really none of those. What it actually is is more interesting, and worth understanding properly before you decide whether it is for you.

What it does is quiet. Not a new face or a changed feature, but your own skin behaving more like it did a few years ago: holding water, resilient again, looking rested rather than dry and tired. If that is what you have been trying to get back, the science of how it works is genuinely worth your attention, because it is cleverer than the marketing around it.

What Profhilo actually is

Profhilo is injectable hyaluronic acid, the same water-holding sugar your skin already makes, in an unusually pure and concentrated form: a single course delivers 64 mg of it in 2 ml, among the highest concentrations of any injectable hyaluronic acid available. But the concentration is not the interesting part. The composition is.

It is not one hyaluronic acid but two, of very different sizes, bonded together into what the chemistry calls a hybrid cooperative complex. That is done with a controlled thermal process the maker calls NAHYCO, and crucially without the chemical cross-linker that gives ordinary fillers their firmness (hybrid complex chemistry, PMID 37623069). Because it is not cross-linked into a stiff gel, it stays fluid and spreads through the dermis from a few points rather than holding a shape where it is placed. That single fact, uncrosslinked and flowable, is why it remodels an area of skin instead of filling a spot, and it is the honest end of the "is it a filler" question: chemically, it is built to do the opposite job.

How it works, in detail

Start with what ageing actually does. Hyaluronic acid is a glycosaminoglycan your skin already makes, a core part of the extracellular matrix that holds the dermis together and keeps it hydrated. With age the skin makes less of it, and the chains it does make grow shorter, so the matrix both holds less water and loses the environment its cells depend on (skin HA and ageing, PMID 41243364). Profhilo addresses both the quantity and the range of chain sizes.

Here is where the two molecular weights matter. The long chains are high-molecular-weight hyaluronic acid, around 1,100 to 1,400 kilodaltons; the short chains are low-molecular-weight, around 80 to 100 (PMID 37623069). They behave differently in the skin, and that difference is the entire design.

The long, high-molecular-weight chains are the stable, water-binding fraction. They hold large volumes of water and break down slowly, which is what produces the sustained hydration and the sense of plumper, more supple skin over the weeks after treatment.

The short, low-molecular-weight chains are the more biologically active fraction, the part associated with prompting dermal fibroblasts back towards activity. On their own, though, short chains are unstable and degrade almost immediately, which is why loose low-molecular-weight hyaluronic acid would be a poor treatment. The thermal bond is what solves that: linking the short chains to the long ones into a stable complex means they are not lost on day one but released gradually as the complex is broken down. So you get a slow, sustained biological signal running alongside the slow, sustained hydration, from one injection, rather than a quick flush of both that is gone in a week.

I have to be precise about that biological signal, because it is exactly where the claims tend to outrun the evidence. The stimulation of fibroblasts, and the increases in collagen and elastin attributed to the low-molecular-weight fraction, come from work on cultured cells, not from living faces (Stellavato et al., 2016, in vitro). It is a sound and specific mechanism, the likely reason the treatment works, but it is not the same as a proven outcome in people. What is measured in patients is the result, not the pathway.

What the evidence shows

A 2025 systematic review of the efficacy and safety of Profhilo found that in real patients it improves skin hydration, elasticity and overall quality (systematic review, PMID 41920062). Those are outcomes measured in living skin, and they are the ones I will stand behind.

The same review was equally clear about the limits: the collagen and elastin effect has not been demonstrated in living human skin, and there are as yet no randomised controlled trials. Read precisely, the picture is a good one, better than most injectables can show: a real, measured benefit to skin quality, a strong safety record, and a mechanism that is well understood even where the largest trials are still to be done.

Who it suits

Profhilo is for skin that has kept its shape but lost its quality: drier, thinner and less resilient than it was, a crepey neck, dull cheeks, ageing skin on the hands. Because it works across an area rather than at a point, it treats the general condition of the skin rather than any one line.

It is the wrong tool for the opposite problems, and I will say so plainly. Where volume has gone and a cheek or fold looks hollow, that is a filler's job. Where tissue has become heavy and lax, a surgical lift does more and lasts longer than anything injected. Profhilo is not a substitute for either, and the quickest way to be disappointed by it is to ask it to do their work.

What a course looks like

Profhilo is a short course, not a single visit: two sessions about four weeks apart, because the effect is built across the two rather than delivered in one, and it keeps developing for several weeks after the second. The injections use fine needles at a few points and are generally well tolerated, with a small bruise or a little swelling the usual extent of it.

From there, because Profhilo is improving the condition of living skin rather than sitting in it, you keep the result with a single session about twice a year rather than watching it fade. I have written the week-by-week detail, and exactly how long it holds in practice, in a separate piece: what Profhilo is, and how long it actually lasts. Current pricing sits on the Profhilo treatment page.

Profhilo or polynucleotides

Not a rivalry, and often not a choice. Polynucleotides improve skin quality too, but by signalling the skin's own repair cells rather than by restoring the hyaluronic acid the tissue has lost, so the two are frequently layered rather than picked between. Which one, or both, depends on the skin in front of me, a call I lay out in full in Profhilo versus polynucleotides. The polynucleotides guide and our skin boosters page go deeper on each.

What Profhilo got right

Beyond any single appointment, Profhilo matters because it treated the quality of the skin as a target in its own right, separate from filling a face or freezing a muscle, and it did so with real chemistry rather than a marketing category. Much of the skin-quality field that followed is built on the same idea, that you can improve the tissue itself rather than only its shape.

If the problem is genuinely the condition of your skin rather than its shape, a consultation is where we work out whether Profhilo is the right tool for it or whether something else fits your skin better.

So when someone sits down and the problem is genuinely the condition of their skin, Profhilo is one of the first tools I reach for. It does one thing, improve the quality of the skin, and it does it well, on a mechanism I can actually explain to you. When that is what you need, it is one of the easiest recommendations I make.