In case you didn’t know, vitamin C is a really valuable player in the skin care game. In fact, after sunscreen and retinol, it’s the most helpful ingredient in defense against premature skin aging, NY-based board-certified dermatologist Dr. Bradley Glodny shared in a previous HuffPost report. But 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!

TruSkin’s vitamin C serum typically runs for around $38.99 for a 2-ounce bottle (despite Amazon’s list $49.99 list price). It also has 10,000 5-star reviews — enough positive buyer testimonials to make a believer out of any skeptic. The nourishing formula works to reduce in fine lines, sun damage and aging spots — improving the appearance of skin conditions like melasma and an overall increase in skin brightness and radiance.

People are raving about how much TLC this serum shows their mature skin — in varying time frames, of course.

“While I believe aging is a gift and I plan to age naturally, I also want to feel good in my skin,” wrote, Sara K, who’d begun noticing fine lines around her eyes. “After using it almost daily for 1 month, I can honestly say I see a huge difference in the appearance of my skin. My age spots are lightening, scarring from picking/scabbing is almost gone, and the fine lines around my eyes are smoother.”