In skin care, vitamin C is a valuable player in defense against premature skin aging.

Serums containing this powerful antioxidant are not always affordable. Some of the most famed preparations, such as iS Clinical’s Super Serum Advance and SkinCeuticals’ C E Ferulic acid serum, can cost upwards of $180. Fortunately for our skin (and our wallets), TruSkin’s vitamin C serum is an affordable alternative that reviewers claim is just as if not more effective as the high end options.

TruSkin’s vitamin C serum, which retails for just $20, has over 104,800 five-star ratings and enough positive buyer testimonials to make a believer out of any skeptic. The nourishing formula promises a reduction in fine lines and sun damage, improvement in the appearance of skin conditions like melasma and an overall increase in skin brightness and radiance.

These purported results are possible since, according to experts, vitamin C works to not only protect skin from external toxins and free radicals that cause premature skin aging, but it’s also clinically proven to enhance collagen production when applied topically.

In addition to sodium ascorbyl phosphate — a less irritating form of topical vitamin C — this fast-absorbing serum is supplemented with ingredients including antioxidant-rich vitamin E, jojoba oil and botanical hyaluronic acid to support hydration.