Is it suitable if my skin is very reactive or sensitive?

The product is described as generally well tolerated, and hyaluronic acid itself is not a known sensitizer for most people. However, the source explicitly advises caution if your face is very reactive: introduce the serum on intact skin only (no open lesions, active eczema, sunburn, or recent professional peels), and combine it with a suitable moisturizing product to support the barrier. Start with once-daily use — for example, in the evening — and monitor for any stinging, itching, or redness over the first week. If your skin reacts to many leave-on products, patch-test behind the ear or on the inner forearm for a few days before applying to the full face. Avoid layering it simultaneously with other new products so you can identify any trigger. If irritation persists, discontinue use and consult a dermatologist or qualified skincare professional. This serum is a cosmetic hydrator, not a treatment for inflammatory skin conditions such as eczema, rosacea, or dermatitis.