Vitamin C and hyaluronic acid are potent active ingredients for the skin that complement each other beautifully, whether you choose a product that incorporates both these elements or two separate products to layer with one another. Here’s what you need to know about adding hyaluronic acid and vitamin C to your skin care routine.The Skinny on Vitamin C SerumVitamin C serum is renowned for its anti-aging properties that result a smooth, even complexion with a youthful glow. Because vitamin C serum is gentle and safe for most skin types, the question of when to use vitamin C serumdepends on your personal preference. For most people, once or twice a day is sufficient. You should use serum after removing makeup, cleansing and exfoliating and toning your skin and before applying sunscreen and moisturizer. This increases its effectiveness, since the vitamin C is added directly to clean skin without built-up debris and dead cells.The Benefits of Hyaluronic AcidThis substance naturally occurs in the body and helps lubricate the joints and the eyes as well as keep the skin soft and supple. Because the supply of hyaluronic acid in the skin decreases as we age as well as with exposure to pollutants and toxins, adding this ingredient to your skin care routine can replenish moisture and smooth the appearance of fine lines and wrinkles.Now that you know how to use vitamin C serum, you also understand how to use hyaluronic acid serum. If you’re using a product that contains hyaluronic acid + vitamin c, follow the directions above. To layer a separate serum for each ingredient, you should generally apply the product with the thinner formula first and allow it to dry.Shop for these products with reputable online retailers. Look for products with high levels of the active ingredients and few fillers that can irritate your complexion. As with any skin care product, test these serums on a small area to see how your skin is affected.