Vitamin C is also known as ascorbic acid and is a water-soluble vitamin that is found in abundance in citrus fruits such as limes, lemons and oranges. When you eat fruits like these, it is not only able to improve your immune system, but also help with important functions such as the biosynthesis of collagen, which in turn will help keep your Because of this, “using a powerful, stable vitamin C serum consistently over time can help smooth out the appearance of fine lines and wrinkles,” Dr. Bowe said. Finally, vitamin C can brighten Vitamin C serum is typically applied once or twice per day. A good rule of thumb is to cleanse, tone, apply vitamin C serum, and then moisturize. It can be safely used with other active ingredients, although using alongside niacinamide may make vitamin C less effective. There are now tons of skincare products with vitamin C touting beneficial effects for collagen production. You can find vitamin C in face wash, lotion, toner, and just pure vitamin C serum. A study looked at how effective topically applied vitamin C was on skin aging in 60 healthy women, compared to a placebo (7). Vitamin C at a concentration of 10%-20% has been shown to have a collagen stimulating benefit. "The more collagen the skin has and the healthier it is, the more hydration the skin can hold. This is always important, but especially during the winter months," says Dr. Greenfield. Product to try: The HydroPeptide Firma-Bright 20% Vitamin C Booster This product contains 15% vitamin C, 1% vitamin E, and 0.5% ferulic acid. The company claims that this serum protects the skin from free radicals, improves the appearance of fine lines and In contrast, the Endocrine Society stated that, for clinical practice, a serum 25(OH)D concentration of more than 75 nmol/L (30 ng/mL) is necessary to maximize the effect of vitamin D on calcium, bone, and muscle metabolism [11,12]. After applying the vitamin C serum, wait for 30 minutes for your skin to absorb it. Then follow up with the retinol product and finish with a moisturizer. You can also use the ingredients separately in your skincare routine. You can do this by using one in your morning routine and the other in the evening routine. The serum should also come in a dark bottle, as vitamin C can become less effective with exposure to light. One of our current favorites is the CeraVe Skin Renewing Vitamin C Serum , which contains a combination of 10% pure vitamin C, hyaluronic acid and ceramides, that works together to brighten and hydrate the skin. Its particularly important for your Vitamin C serum to be stored in a dark glass bottle and feature a medicine dropper (rather than a pump) to ensure the freshest delivery of the serum. Exposure to air, light and heat can deteriorate the quality and stability of your Vitamin C serum. 4rQ5mw.