Key facts
- Category
- Injectable skin-quality treatment, distinct from dermal filler
- Hyaluronic acid boosters
- Non-cross-linked or lightly bonded HA that spreads through the dermis and binds water; Profhilo is 64 mg hybrid HA per 2 ml, thermally bonded without BDDE
- Polynucleotides
- Purified DNA fragments, usually from salmon, at about 20 mg/ml in Rejuran; directed at fibroblast and repair activity
- PDLLA
- Poly-D,L-lactic acid, a resorbable polymer that acts as a collagen scaffold
- What none of them do
- Add volume, alter facial shape, lift descended tissue or clear pigment
What is a skin booster?
A skin booster is any injectable placed into the skin to act on its quality rather than its shape. Fine lines, dullness, dehydration, crepiness and surface texture are its territory; volume and contour are not. The material is delivered in small deposits across an area, by needle or cannula, into the dermis, the layer the skin barrier exists to keep large molecules out of. That is the whole point of the category: not a stronger cream, but a different route to a layer creams cannot reach.
Several distinct classes share the label. Hyaluronic acid boosters place lightly stabilised or non-cross-linked HA in the dermis mainly to hydrate; Profhilo is a hybrid of high and low molecular weight HA bonded thermally rather than with a chemical cross-linker, designed to spread and remodel. Polynucleotides such as Rejuran are purified DNA fragments directed at repair-oriented cell activity. PDLLA is a resorbable polymer that recruits the patient's own collagen over the weeks that follow. These are not interchangeable.
How is it used in aesthetic medicine?
The person who tends to benefit is one whose complaint is genuinely dermal: skin that looks tired despite a reasonable routine, fine crepiness, a dull or dehydrated quality that good topicals have not shifted. Which class suits depends on what the skin is short of, which is a question for examination rather than a menu choice. Dr Sin Yong sets out how the classes are chosen on his skin booster treatment page, and Profhilo and Rejuran each have a page of their own.
After injection, small raised points, redness and occasionally bruising are expected and settle; polynucleotides tend to leave more noticeable bumps at first than a hyaluronic acid booster. Most plans have an initial phase and a maintenance phase, with intervals set by the product and by how the skin holds the change rather than by the calendar. Barrier care and daily sunscreen remain necessary throughout, because a booster works in a layer below the one topicals protect.
“A skin booster treats the quality of the skin. A filler occupies space. Confusing the two is the most common error patients arrive with.”
Dr Sin YongOn the distinction between a booster and a filler
What is it often confused with?
The most common confusion is with dermal filler. A filler is a cross-linked gel engineered to occupy space and hold a contour in a specific location; a booster is designed to spread through or act on the dermis without projecting anything. A patient who wants a hollow cheek corrected needs a filler, and giving them a booster will disappoint; a patient whose skin has thinned needs a booster, and giving them filler produces a face that is fuller but no better in quality.
Nicknames add to the confusion. Water light injection, the Chanel injection, salmon DNA and bio-remodelling all describe real treatments, but they are not the same material, and the useful move is to translate every name back into its class. Boosters are also confused with collagen biostimulators such as Sculptra or Ellansé, which are placed deeper and aimed at structure, and with needle-free routes such as the Deep Synergy Booster, which delivers actives from the surface with ultrasound and cannot place product at a chosen depth.
When is it not the answer?
A booster does not address pigment, does not lift descended tissue and does not replace lost volume. If the real complaint is melasma or sun spots, a laser or topical plan applies; if it is laxity, energy-based lifting is the relevant tool; if it is a tear trough hollow, that is a volume deficit that a booster will not correct. Under the eyes, polynucleotides can act on thin, crepey skin, but they do not reduce herniated fat.
For acne scars, a booster can improve the quality of the skin around the scars, but it does not release tethered scars or rebuild a scar base; those jobs belong to subcision, RF microneedling, fractional CO2 resurfacing and TCA CROSS. A pore is a structure and no injection shrinks it. Where the skin barrier is disrupted, over-exfoliated or reactive, repairing that comes before injecting anything, and active skin disease in the area is a reason to wait.
