What is the average duration of hyaluronic acid injections ?
The results of hyaluronic acid injections generally last between 6 and 12 months, but may persist for over a year. This duration varies depending on the gel used, the area treated and the patient’s individual characteristics.
The Health Canada information on cosmetic injections describes this variability.
This is an indicative duration, as not all products and facial areas have the same persistence. The expected duration should therefore be specified according to the treatment performed.
For durations in different facial areas, see the page on the duration of hyaluronic acid effects by area.
Which factors can accelerate the breakdown of hyaluronic acid ?
The rate at which injected hyaluronic acid breaks down depends mainly on the composition of the gel, the area treated and the characteristics of the tissues.
Cross-linking, which involves linking hyaluronic acid molecules together, slows their breakdown and prolongs their presence in the tissues. The product’s formulation and the specific characteristics of the injected area also influence how long it persists.
Smoking and ultraviolet exposure accelerate skin ageing, but have not been shown to directly reduce the duration of injection results. Likewise, there is no robust evidence that exercise, stress or lack of sleep accelerate gel resorption.
A rapid reduction in the results does not necessarily mean that the hyaluronic acid has been completely broken down.
The FDA overview of dermal fillers explains the role of cross-linking, among other things.
The factors influencing its persistence are detailed in the article on hyaluronic acid breakdown and its causes.
What precautions should you take immediately after a hyaluronic acid injection ?
After a hyaluronic acid injection, certain precautions help limit unwanted after-effects. They must be tailored to the area treated and the doctor’s recommendations.
The instructions depend on the product, the injection site and your reactions :
- Avoid handling the injected area. Do not massage or apply significant pressure to the area unless instructed by your doctor. Do not try to move the product or correct an irregularity yourself.
- Avoid intense physical exertion for 24 hours. Returning to exercise depends on the after-effects of the injection. If there is significant pain or swelling, it is preferable to postpone activity.
- Limit exposure to intense heat. Temporarily avoid saunas, steam rooms and very hot baths, following the instructions you receive. This precaution is intended to limit reactions after the injection, rather than prevent the breakdown of the gel.
- Observe the recommended intervals before other aesthetic treatments. Before a facial massage, peel, laser or radiofrequency treatment, disclose the injections you have had and ask your doctor how long you should wait.
These precautions support good recovery after injections, but have not been shown to prolong the results by several months.
How can you optimise the longevity of hyaluronic acid injections in everyday life ?
An appropriate skincare routine and a healthy lifestyle help preserve skin quality and facial appearance after hyaluronic acid injections. However, they have not been shown to slow the breakdown of the injected gel.
Several habits are recommended :
- Protect your skin from the sun. Use broad-spectrum sunscreen every day, seek shade and avoid prolonged exposure. These precautions limit ultraviolet damage and photoageing.
- Maintain good skin hydration. Choose gentle cleansing and a suitable moisturiser. If dryness or irritation persists, have your routine reassessed rather than adding more products.
- Adopt a healthy lifestyle. Avoid smoking, eat a balanced diet and make sure you get enough sleep. These habits help preserve skin health and quality.
A randomised trial of daily sunscreen use showed a reduction in sun-related skin ageing, but does not demonstrate that sunscreen prolongs the effects of hyaluronic acid injections.
Does drinking more water or using a hyaluronic acid cream make injections last longer ?
No. Drinking more water or applying a hyaluronic acid cream does not prolong the effects of injections. No study has shown that these habits slow the breakdown of the injected gel.
Normal hydration, suited to the body’s needs, is sufficient. There is no particular amount of water or drinking schedule that prolongs the results.
Hyaluronic acid creams improve hydration at the skin’s surface, but do not act on the gel injected deeper into the skin or restore lost volume.
Likewise, some dietary supplements have shown effects on skin hydration, but there is no clinical evidence that they slow the resorption of injectable hyaluronic acid.
Do you need to stop exercising or avoid saunas in the long term to maintain your injections ?
No. You do not need to stop exercising or avoid saunas in the long term to prolong the results of hyaluronic acid injections.
After observing the recommended precautions in the days following the injection, you can resume your usual activities according to the recovery of the treated area.
There is no robust scientific evidence that exercise or sauna heat accelerate the breakdown of the injected gel. There is therefore no justification for avoiding them for several months.
If an activity causes unusual pain or swelling in the injected area, medical advice is recommended.
Are regular top-ups necessary to prolong the results ?
No. Hyaluronic acid top-ups are not always necessary. A further injection should only be considered when changes in the results justify additional correction.
The follow-up appointment allows the amount of product still present to be assessed and determines whether another injection would be useful. Regularly adding hyaluronic acid without a specific indication can lead to product accumulation and an excessive result.
Follow-up arrangements are detailed on the page about maintaining hyaluronic acid injections.
When should you request a check-up if the results diminish ?
A follow-up consultation is recommended when :
- The results diminish more quickly than expected.
- The correction achieved seems insufficient.
An examination helps identify the cause and determine whether another injection is indicated. Increasing quantities solely to prolong the results is not always an appropriate response. Possible causes are detailed in the article on hyaluronic acid injections that do not deliver the expected results.
Immediate medical attention is necessary in the event of unusual pain, skin blanching, mottled discolouration or a visual disturbance; immediate medical care is essential. These symptoms may indicate a vascular complication and must not wait for a routine follow-up appointment.
