YOUTHDAY Hyaluronic Acid Serum – 1.01 oz

Yes. Hyaluronic acid with other products especially on the skin considered safe to use. However, you can check with a dermatologist about any other products you are applying for adverse reactions.

Onto damp skin, after cleansing and before your moisturiser. It works by holding water, so applying it to dry skin in a dry room gives you less than applying it damp and sealing it with a cream on top.

For hydration, yes — it holds water in the upper layers of the skin, which makes skin look plumper and fine lines less prominent while it is well hydrated. It is a hydrator, not a wrinkle treatment, and the effect depends on using it consistently and sealing it with a moisturiser.

Hyaluronic acid is used on the skin for improving hydration and locking in moisture in the skin. It improves the flexibility as well as elasticity of the skin, making wrinkles and fine lines less prominent.

Yes. It hydrates without adding oil, which is why it suits oily and combination skin, and it is a common choice alongside drying actives to keep skin comfortable.

Yes — morning and evening is normal. Follow with a moisturiser, and with SPF in the morning.