Hyaluronic acid is a substance naturally produced by our body. It is a sugar whose synthesis inexplicably lowers over time.
This polysaccharide is a major agent for skin hydration thanks to its hydrophilia (ability to attract water). It is broken down by the intracellular enzymatic system (hyaluronidase) and free radicals (stress, lack of sleep, smoking, sun exposure).
The skin’s hydration therefore depends on the balance between the synthesis of hyaluronic acid (which attracts water) and the action of the endogenous hyaluronidases (which break down the hyaluronic acid).
As we age, this balance changes and the hyaluronidases start to win the battle, and what is more, the quality of the hyaluronic acid produced goes down.
The result, to varying degrees, is:
In women, after the menopause, the drop in hormones (primarily progesterone and oestrogen) leads to a more significant drop in hyaluronic acid synthesis in the dermis than in men.
Hyaluronic acid boasts a number of properties, among which are:
Today, aesthetic medicine in France must, above all, be safe.
Hyaluronic acid injections are the ultimate medical tool because they are completely resorbable and biodegradable over time.
These “fillers” are designed to last longer than endogenous hyaluronic acid (made by the body), namely thanks to the process that cross-links the molecules during manufacture.
The amount of time these injectables last depends on the product used, the areas injected and the indications:
Skinboosters, mesolift: the hyaluronic acid used is weakly cross-linked, the molecules are small and are very hydrophilic.
On average, the effects last 3 to 6 months.
The main indications are creased cheeks, peri-buccal wrinkles (“barcode” lines) and a loss of firmness in the face.
The injections are pain-free and are performed into the superficial layers, yet the product is not visible to the naked eye. The “fresh-faced” appearance is almost instantaneous.
The hyaluronic acid used is specially made and designed to fill fine lines, deep wrinkles and hollows. These fillers tend to last longer, generally around 9 months to 1 year.
The main indications are injections into the nasolabial folds, expression lines, lips, tear trough and under-eye circles.
Note that the under-eye area is slightly different because the product used is still hyaluronic acid but this time it is synthesised and shaped so as to reduce its hydrophilia as much as possible to avoid causing bags to appear around the eyes.
Furthermore, since this area of the face has very low levels of endogenous hyaluronidase, this means that the product lasts longer: one or sometimes two years.
“Volumising” hyaluronic acid is essentially made up of large molecules so it allows us to create better and more natural projection in the deep structures that have started to sag over time.
The main indications are the cheekbones, the tear trough, the chin, the cheeks and the temples.
The effects last 12 months on average, sometimes more if the patient has a healthy lifestyle (no smoking, no sun or UV exposure, proper hydration, etc.).
Whatever the indication, the results are visible immediately after the hyaluronic acid injections and improve by around 30% in the month that follows (since they draw water to and therefore hydrate the areas treated).
Before any hyaluronic acid injections, your doctor must rule out any possible counterindications for this type of treatment, which are:
These temporary or permanent counterindications are evaluated case by case in your first appointment with your aesthetics doctor, who will examine your skin after asking you about your medical and surgical history.