A Vitamin C skincare set usually includes a range of products infused with Vitamin C, known for its antioxidant properties and its ability to brighten and even out skin tone. A typical 5-in-1 skincare gift set might contain:

1. Cleanser: The set often includes a Vitamin C-infused cleanser. This cleanser helps remove impurities, dirt, and makeup while providing a boost of Vitamin C to brighten the skin.

2. Serum: A Vitamin C serum is commonly included for its concentrated formulation, aiming to address hyperpigmentation, dullness, and improve overall skin texture.

3. Moisturizer: A Vitamin C-infused moisturizer helps in hydrating the skin while offering antioxidant benefits. It may also aid in reducing the appearance of fine lines and wrinkles.

4. Eye Cream: Some sets may include an eye cream or gel infused with Vitamin C to target dark circles, puffiness, and fine lines around the eyes.

5. Face Mask or Treatment: This could be a mask or treatment specifically formulated with Vitamin C to provide an extra boost of brightening and revitalization to the skin.

These sets often offer a comprehensive approach to skincare, aiming to address multiple concerns like dullness, uneven skin tone, and signs of aging while providing antioxidant protection.

Before using a Vitamin C skincare set, it's advisable to perform a patch test, especially if you have sensitive skin, to ensure compatibility. Additionally, incorporating these products into your skincare routine gradually can help your skin adjust and prevent any adverse reactions.

A skincare routine that includes a toner, face serum, face cream, and eye cream can provide comprehensive care for the skin. Here's a breakdown of each product's purpose:

1. Toner: Toner is used after cleansing to balance the skin's pH levels, remove any remaining impurities, and prepare the skin for better absorption of subsequent skincare products. Some toners also offer additional benefits like hydration, pore refinement, or soothing properties, depending on their formulation.

2. Face Serum: Serums contain concentrated active ingredients targeting specific skincare concerns. A face serum, for example, might include ingredients like Vitamin C, hyaluronic acid, or peptides. They penetrate deeper into the skin to address issues such as hydration, brightening, firming, or reducing the appearance of fine lines and wrinkles.

3. Face Cream: Face creams or moisturizers are essential for hydrating and nourishing the skin. They provide a protective barrier and help lock in moisture. Depending on the formulation, they can cater to various skin types—some might focus on lightweight hydration, while others could offer richer moisture for dry skin.

4. Eye Cream: Eye creams are formulated specifically for the delicate skin around the eyes. They address concerns like puffiness, dark circles, and fine lines. Ingredients such as peptides, caffeine, or Vitamin C are commonly found in eye creams to help rejuvenate and brighten the eye area.

When incorporating these products into your routine, it's crucial to consider your skin type, concerns, and the specific ingredients in each product. Layering these products from lightest to heaviest consistency (toner, serum, moisturizer, eye cream) generally allows better absorption of each product.

Also, always perform a patch test with new products, especially if you have sensitive skin, and gradually introduce them into your routine to monitor how your skin responds. Consistency and patience are key to seeing improvements in your skin's health and appearance.