“Concentrations of 5% niacinamide have been shown to [improve] skin appearance with little risk of sensitivity, though it’s always best to start with a lower concentration first to see how it works for you and your skin,” says Turner. Concentrations of 5% niacinamide or higher may cause irritation, so it’s important to remember that “more” does not always equal ‘better,” according to Turner.

While he states that there aren’t any cons to using argan oil in your hair, he does advise being cautious if you have allergies—Dr. Turner specifically warns those with nut allergies to avoid the products. As previously stated, you may need to play around with the amount of product you use, as Dr. Ciraldo notes that many of her patients developed acne near their hairline after using too much of the ingredient.

Dealing with dark spots, discoloration, redness or melasma? Tranexamic acid serum is going to be your MVP. According to Dr. Turner, this ingredient can reduce the skin’s melanin production by stabilizing blood vessels and, when taken orally, treat melasma.

“Tranexamic acid, just like other things that are acidic, can be a bit irritating,” he notes, which is why he recommends layering moisturizer over the serum. Dr. Turner also advises that you ease into using the serum into your routine the same way you would retinol. (Speaking of retinol, make sure to use the two ingredients separately while your skin is acclimating.—Dr. Turner recommends tranexamic acid in the morning and retinol at night.)

“Certain materials result in friction, causing your skin to drag on the fabric, which can lead to wrinkles as well as tangled hair,” New York City dermatologist Ryan Turner, MD, FAAD, explains. “Silk is one of the most popular choices for those looking for smooth, skin-loving fabrics for their pillowcases, as it facilitates glide, preventing snags that could occur while turning and tossing in bed, contributing to skin irritation, wrinkles, and hair breakage.”

TRNR Skin was cofounded by board-certified, Harvard-trained NYC dermatologist Dr. Ryan Turner, and the brand’s three-step debut collection has impressed us. The moisturizer is super-hydrating yet not thick or sticky. It contains ceramides derived from jojoba oil and rice bran, to repair the skin barrier, plus squalane, to promote moisture. The prebiotics work to promote a healthy skin microbiome—a must during harsh winter weather.

Dr. Turner says that depending on your skin type, it can be used as a replacement for a traditional moisturizer, or it can be blended with a richer formula to amplify its moisturizing benefits. "If you’re a truly low-maintenance skincare user, you can use it to replace your entire daily routine save for SPF, but I’d recommend sticking to the incorporation of dedicated antioxidants, retinols and occasional chemical exfoliants."

“Puffiness under the eyes caused by variation in fluid retention and lymphatic flow is also a reason to choose a dedicated eye cream that contains things like caffeine or potent antioxidants like arnica or vitamin C,” board-certified dermatologist and TRNR Skin co-founder Ryan Turner tells Bazaar. “Treatment of dark circles is challenging, so look for dedicated active ingredients that focus on hyperpigmentation or fragile blood vessels.”

Featured Product: TRNR Skin Glycolic Gel To Foam Cleanser

The secret to this cleanser's glow-boosting magic? Glycolic acid, a derm-favorite AHA that dissolves dead skin cells to reveal a brighter, smoother complexion. I personally like to wash with it in the morning (and then apply my antioxidant serum and moisturizer with SPF) to give my skin a nice little glow to start the day. But if you're using it at night, I recommend starting with a cleansing oil or balm first to breakdown any makeup first since in my testing experience it doesn't fully remove long-wear or waterproof makeup.

• Formula: Cleanser

• Skin types: All

• Chemical or physical exfoliator: Chemical

• Key ingredient: Glycolic acid, grapeseed extract, green tea extract, aloe leaf juice

“Skin sensitivity is a major factor that determines which ingredients you incorporate into your anti-aging routine,” Turner adds. “If you have very sensitive skin, look for products with low concentrations of these actives when starting to add them into your regimen; you may want at first to avoid retinol altogether starting with other actives or consider starting a retinol alone and build up your skin’s tolerance.”

“While there are certainly budget-friendly, dermatologist-approved brands that you can find at the drugstore, these lines may not be formulated or developed by a dermatologist — rather, tested or approved by one,” says Dr. Ryan Turner, M.D., a board-certified dermatologist in New York City and cofounder of TRNR Skin, which launched in November. “I felt strongly that there needed to be another option — one that bridges the gap between more basic, affordable skin care and highly clinical, expensive products.”