Using a Vitamin C serum for acne-prone and glowing skin can be highly beneficial due to its antioxidant properties, ability to boost collagen production, and its role in enhancing skin brightness. Here's a guide to effectively use Vitamin C serum in Pakistan for these purposes:

1. Choose the Right Serum:

   • Look for serums with L-ascorbic acid, which is the most effective form of Vitamin C.
   • Consider serums that also contain hyaluronic acid, as it hydrates the skin without causing breakouts.
   • Check for a concentration of Vitamin C that suits your skin type. For sensitive or acne-prone skin, start with a lower concentration (around 10%) and gradually increase.

2. Patch Test:

   • Before applying the serum to your face, do a patch test on a small area of your skin, such as your forearm, to ensure there's no allergic reaction.

3. Cleanse Your Skin:

   • Thoroughly cleanse your skin to remove impurities and excess oil, which could interfere with the absorption of the serum.

4. Apply the Serum:

   • Apply a few drops of the Vitamin C serum to your face and neck. Gently massage it in an upward motion until fully absorbed.
   • Be careful around the eyes and avoid direct contact with them.

5. Combine with Hyaluronic Acid Serum:

   • If you're using a separate hyaluronic acid serum, apply it after the Vitamin C serum as it helps in locking in the moisture.

6. Moisturize and Sun Protection:

   • Always follow up with a non-comedogenic moisturizer to keep your skin hydrated.
   • During the day, apply a broad-spectrum sunscreen, as Vitamin C can make your skin more sensitive to the sun.

7. Consistency Is Key:

   • Use the serum regularly, ideally once a day, to see noticeable results. Consistency is crucial in skincare.

8. Monitor Your Skin:

   • Pay attention to how your skin responds. If irritation occurs, reduce the frequency of use or try a serum with a lower Vitamin C concentration.

9. Storage:

   • Store the serum in a cool, dark place to prevent oxidation. An oxidized serum (usually turned brown) is less effective and should be replaced.

Remember, individual skin types react differently to skincare products, so what works for one person may not work for another. It's always recommended to consult with a dermatologist before starting any new skincare regimen, especially for those with sensitive or acne-prone skin.