The product you are asking about, The Ordinary 100% L-Ascorbic Acid Powder, is a unique and potent form of Vitamin C. Unlike a pre-mixed serum, this product comes as a very fine powder that you customize and mix yourself. The "F-Mask" and "Original" in your query seem to be user-added terms, as this is the standard product name from The Ordinary.

Key Features and Benefits

100% Pure Vitamin C: The powder contains a high concentration of L-Ascorbic Acid, which is the most potent and direct form of Vitamin C for topical use. This allows for maximum efficacy.

Brightening and Anti-Aging: As a powerful antioxidant, Vitamin C is highly effective at brightening dull skin, reducing the appearance of uneven skin tone and dark spots, and fighting signs of aging.

Customizable Concentration: The powdered format gives you complete control over the potency of your Vitamin C treatment. You can mix a small amount with other water-based serums, moisturizers, or lotions to create a custom formula that your skin can tolerate. This is a significant advantage, as it prevents the rapid oxidation and loss of efficacy that can occur with pre-mixed liquid Vitamin C serums.

Targets Multiple Concerns: This product is ideal for addressing a range of skin issues, including dullness, hyperpigmentation, uneven texture, and fine lines.