Glow Gene Vitamin C Serum is a brightening facial serum built around vitamin C, an antioxidant widely used in skincare to help even the appearance of skin tone, soften the look of dark spots and improve overall radiance.

Vitamin C is most commonly used in the morning, because its antioxidant activity complements sunscreen — but it does not replace sunscreen, and using it without one on Pakistan's UV levels wastes most of the benefit. Apply three to four drops to clean, dry skin, let it absorb for a minute, then follow with moisturiser and a broad-spectrum SPF.

Vitamin C oxidises on exposure to light, air and heat. Keep the bottle tightly closed, store it away from direct sunlight and out of a hot bathroom, and expect the colour to deepen slowly over the life of the bottle. A serum that has turned dark brown has oxidised and should be replaced. Patch-test before first use; tingling on first application is common, but persistent stinging or redness means you should stop and consult a dermatologist.