I am new to vitamin C serums. How should I introduce this 15% vitamin C serum to my routine? — Deba facial serum with vitamin c and tomato extract 30 ml.

If you are new to vitamin C or have sensitive skin, it is wise to introduce this serum gradually. The formula contains 15% vitamin C, which is a moderate-to-high concentration for a leave-on product. Starting slowly helps your skin build tolerance and lets you notice any reaction early.

Here is a practical approach:

• Do a patch test first: apply a small amount to a discreet area, such as the jawline or behind the ear, and wait 24 hours to check for redness, itching, or burning.
• Begin by using the serum every other day or 2–3 times a week, rather than daily. Apply a thin layer to clean, dry skin.
• If your skin tolerates it well after a week or two, you can increase to daily use. If you notice any irritation, reduce frequency or pause until the skin calms down.
• Always follow with a moisturizer to help maintain the skin barrier, and if you use it in the morning, finish with a sunscreen.

Because this is a serum, it is lighter than a cream but more concentrated. A few drops are enough for the whole face. Avoid the eye area and do not apply to irritated or broken skin. If you have a chronic skin condition, are pregnant, breastfeeding, or are on medication, consult a specialist before using this product.