The Ordinary 100% L-Ascorbic Acid Powder - 20g

Start by using it once a day, preferably in the evening. You can increase the frequency as your skin becomes more tolerant.

Yes, but avoid mixing it with products containing Niacinamide or EUK 134.

The tingling sensation is normal and indicates that the Vitamin C is actively working. It should subside as your skin adjusts.

Store in a cool, dry place, away from direct sunlight.

Use with caution. Start with a very small amount and mix with a hydrating product to minimize potential irritation. Consider consulting with a dermatologist.

Slight discoloration is normal due to oxidation. If the color changes significantly (e.g., dark brown), the product may have degraded, and it's best to discontinue use.

The product's shelf life depends on how it is stored and used. Ensure the container is properly sealed after use.

Reduce the amount of powder used or the frequency of application. Mix with a more hydrating product to dilute the concentration. If irritation persists, discontinue use and consult a dermatologist.

Ensure the serum or moisturizer you are mixing with is fluid enough. Mix thoroughly until the powder is fully dissolved. You might need to experiment with different mixing ratios or products.