Dermal fillers are a crystal clear gel that is injected into the skin (or for some treatments just under) in small amounts to restore volume and structure. It is based on hyaluronic acid, similar to the body’s own hyaluronic acid that diminishes as we age. CACI Centre advises and uses Restylane®. Other products are available on request. The hyaluronic acid in Restylane is non-animal which means that no skin tests are needed and that there is a minimal risk of allergic or hypersensitive reactions.