On Wednesday 11th March, 2020, the world health organization (WHO) announced novel coronavirus (COVID-19, also called SARS-CoV-2) as a pandemic.

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Hyaluronic acid (HA) is an endogenous substance detected and isolated from various tissues and biological fluids. Owing to its physicochemical properties, HA contributes to many biological processes at intra-and extracellular levels, such as skin hydration, joints lubrication, and wound healing, besides its anti-inflammatory and antioxidant effects. The current review highlights the employment of exogenous HA in many aesthetic and dermatological aspects. Also, it aims to clarify the skin rejuvenating activity by compensating for the biological loss of HA with advanced age. Other positive impacts of HA on hair, nail, and overall health status were also revised. Cosmetics and cosmeceuticals that contain HA, among other active ingredients, are commercially available in different dosage forms such as gels, creams, intradermal injections, and fillers. Aesthetic enhancement is achieved via soft tissue augmentation, skin hydration level increasing, grooves refilling, and collagen and elastin biosynthesis stimulation. HA contributes to various therapeutic approaches such as gingivitis, stomatitis, ulceration, and osteoarthritis. Additionally, it has beneficial uses in dentistry due to its antioxidant and anti-inflammatory properties. The recent implication of HA following the claims that it has a rejuvenating power for the skin and many therapeutic benefits has to be thoroughly investigated and delivered by a trained expert to avoid undesirable effects.

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