“AHA, BHA, retinol, and benzoyl peroxide can be mixed with moisturizing ingredients like hyaluronic acid, ceramides, and rosehip oil to get effective results — just ensure you are not using retinol as well as AHA or BHA's during the day," says Graf.
A combination of retinoids and humectants such as niacinamide, panthenol, glycerin, and hyaluronic acid can help slow down TEWLs during application of retinoid. Hyaluronic Acid is an excellent ingredient to alleviate some of these concerns.
Don't mix: Retinol with vitamin C, benzoyl peroxide (BPO) or alpha and beta hydroxy acids, otherwise known as AHAs and BHAs (glycolic acid and salicylic acid). Layering these products one after the other could cause irritation.
What Are the Benefits of Combining the Two? Good news: Retinol and hyaluronic acid actually have a synergistic effect. “They can be combined so that the benefits of retinol can be achieved more easily with concomitant use of hyaluronic acid, which helps to prevent retinol irritation,” says Hartman.
Pairing the two ingredients is safe and can make retinol easier to use. Niacinamide helps hydrate the skin, which reduces the risk of irritation caused by retinol. Niacinamide and retinol can be combined in one product or used as separate products.
The truth: You can use vitamin C with retinol and retinoids. Get them as separate products so you can tailor the concentration of each and use them at the right time of day. Although vitamin C can be used day or night, it is ideal for daytime use, while retinol and retinoids should be applied at night.
Hyaluronic Acid and Niacinamide
These water-based treatments are a great pair and are made for all skin types — especially babes with dry, acne-prone skin. You'll find niacinamide, a form of vitamin B3, in my Rewind Retinol Serum. Use hyaluronic acid first, followed by my retinol for the best results.
When using hyaluronic acid and retinol, apply retinol first, then hyaluronic acid.
When it comes to mixing all three together, the best order to apply them is by starting with retinol, followed by hyaluronic acid, and finally niacinamide. By applying retinol first onto a fully cleansed skin the ingredient can penetrate into the lower layers.
No matter which form you choose to incorporate your hyaluronic acid, it should be close to the final step in your routine. If you are using it in serum form, you'll apply it immediately after your retinol. If it is part of your moisturizer, it will be your last step.
It's best to apply Vitamin C before Retinol, as Vitamin C has a lower pH than Retinol. Once your skin absorbs the Vitamin C serum, your skin will return to its regular pH levels after 30 minutes or so. (You want your skin to return to its normal pH levels so vitamin C doesn't lower the pH of retinol.)
Rouleau says the best time to use a scrub is in the morning. Overnight you've loosened up dead skin cells with your glycolic acid or retinol products, making the morning a perfect time to brush them off.
Retinoids work best if you use them daily. Specifically, they should be used at night because some types are deactivated by light and air. It's important to start slowly and allow your skin time to adjust. Using too much too quickly can cause redness, dryness, and irritation.
Should you use retinol under your eyes? Yes, definitely. While it is true that retinol – a form of vitamin A – is a powerful ingredient and the skin under your eyes is delicate, there's no reason why you should miss out on the amazing benefits of retinol.
Regardless of your skin type or which product you use first, a layer of moisturizer should always be applied after retinoids.
While Vitamin C serum predominantly protects your skin from damage, retinol serum actively heals the damage on your skin. Vitamin C serum protects the collagens while the Retinol serum helps in cell turn over thereby creating new collagens.
Use Exfoliants Sparingly After the Adjustment Period
After two to six weeks of using tretinoin, it's usually okay to start using an exfoliant. However, it's best to use exfoliating products as sparingly as possible while using tretinoin to avoid potentially irritating your skin.
Retinol (leave to absorb for 10-20 minutes)
Retinol is also an ingredient that should be left to absorb sufficiently into the skin before following up with another product. “It is important to leave a 10-20 minute wait time before applying the next product.
Dr. Mariwalla says coating your skin with Vaseline after applying retinoids or AHA acids would increase penetration of these ingredients, potentially leading to irritation.
Retinoid or Retinol and Salicylic Acid
But on its own, each can dry out the skin, so together they should be combined with caution. The risk is overdrying, which can lead to irritation and make the situation worse.
Don't Mix: AHA/BHA acids with retinol. "I strongly caution those also using retinoids for acne or anti-aging as the combination with various acids may cause excessive skin sensitivity, irritation, and redness. In fact, AHA and BHA should not typically be used together with retinoids on the same day," explains Dr.
Can you use retinol and glycolic acid at the same time? Yes and no. You can use them at different times on the same day if your skin can tolerate it, but generally speaking it's best to alternate days to avoid sensitivity.
When you use retinol, explains Paviol, "you are also receiving the collagen-building effects of vitamin A.” Additionally, retinol also works to improve the penetration of peptide creams and serums which can help improve skin firmness. When combined, you'll improve the efficacy.
Hyaluronic acid is best if they're looking to moisturize dry skin, while retinol works better by encouraging better skin by boosting collagen production. They have several benefits that can work in tandem for better results, though patients need to be careful with the exact formulations they use.
Layering products correctly is important if you want your products to work. If you place one product on your skin, like a serum, and follow up with another product whose molecules are smaller than the first, like a toner, then the second product cannot penetrate the first layer.