Having two different cleansers for morning and night sounds unnecessary, but Jaliman says it's good to mix it up. “You can use a salicylic acid–based cleanser in the morning to unclog pores and avoid acne and a glycolic acid–based cleanser at night to exfoliate your skin and get rid of dead skin cells,” notes Jailman.
However, while glycolic acid can be beneficial in conjunction with other, gentler skin-care acids like salicylic, combining it with more hard-core exfoliating ingredients is best avoided.
One of the most popular Beta Hydroxy Acids (BHAs), salicylic acid is an ultra-common ingredient in many acne fighting products, and is well-suited for both day and night.
But overall, stick to using water-based products and serums together. AHAs and BHAs, such as glycolic, salicylic, and lactic acids should never be used with Vitamin C. Vitamin C is an acid, too, and is unstable, so the pH balance will be thrown off by layering these ingredients together and might as well be useless.
Use Salicylic Acid in the morning and Retinol at night. Those with more sensitive skin may need to use these products on alternate days, or reduce Salicylic Acid use to once a week or as and when needed.
By using a salicylic acid enriched wash after cleansing the skin of any remaining makeup, you are helping to rid the skin of any dead skin cell build-up allowing any nourishing products applied afterwards to absorb quicker into the lower layers of the skin and show results quicker.
One ingredient that can be layered with glycolic acid with no worry of irritation is hyaluronic acid as this humectant can instantly hydrate the skin and aid replenishment, this is an ideal teammate for glycolic acid as it avoids any chances of the skin feeling tight, dry or irritated.
“AHAs and BHAs can certainly be combined. For example, for oily skin, a salicylic-based cleanser can be used followed by a glycolic acid toner. Generally, a glycolic acid is great for dry, dehydrated or combination skin, whereas salicylic acid would be perfect for oily/spot-prone/acne skin.
Just take care to avoid applying any products containing active ingredients, like vitamin C, directly after using glycolic acid. You'll also want to avoid using other AHAs with glycolic acid, since mixing them can cause a reaction.
What not to mix it with? This toner shouldn't be used with other strong acids (like lactic acid), retinol, peptides, or niacinamide. If you're ever unsure whether you should layer actives, go the basic route and separate them.
Salicylic acid creams that are only 1% or 2% in strength, you can leave it overnight on the skin and rinse it off in the morning. Remember to use a good broad spectrum sunscreen because salicylic acid can make your skin sensitive.
Don't use with: Although salicylic acid can be combined with other exfoliating ingredients, Mudgil says that in order to avoid irritation, it's best to stick to only one exfoliant at a time.
Apply 2-3 drops after cleansing & toning. Let the serum absorb fully into the skin before moving on to the next step of your routine. When to use: PM. Start with every alternate day and after 2 weeks of usage, use it everyday.
“You can use a salicylic acid–based cleanser in the morning to unclog pores and avoid acne and a glycolic acid–based cleanser at night to exfoliate your skin and get rid of dead skin cells,” notes Jailman.
A salicylic acid cleanser can be combined with a serum for oily skin and acne-prone skin, but people with dry skin should not go overboard. Salicylic acid lotion and serum should not be used together for any skin type as too much of anything can be destructive.
Certain shampoos do contain this BHA as it helps soothe inflammations and clears up dandruff and scaling. If acne and blackheads are your main concern, and if you have oily to combination skin, you can give Salicylic Acid a shot. Below the age of 2 years, the use of this active is not recommended.
"If salicylic acid is an ingredient in your cleanser, it is fine to use it every day." However, if you are using an exfoliant that salicylic acid in the formula, Dr. Hu advises only using the product three times per week, to avoid over-exfoliating the skin and drying it out.
Even though niacinamide and glycolic acid are both natural and have similar benefits, it is not advisable to use them together because of their pH levels. While niacinamide has a much higher pH level than glycolic acid, it won't get completely absorbed into the skin.
Another frequently asked question about the 7 Skin Method is it is possible to use multiple toners through the many layers. To that, we say yes! Our rule of thumb when it comes to layering different toners is to layer them on from the thinnest viscosity and texture, to the thickest, richest texture.
How long should I leave salicylic acid cleanser on my face? This can vary depending on how much time you take to cleanse your skin. For many, the 60 second rule has proven to be the most effective.
Using both together will however can become too much for the skin and lead to irritation, rashes, redness, flakiness and all-round discomfort. Much like vitamin C and niacinamide, if you are wanting to use both separate the products completely and apply salicylic acid in the morning and retinol for the evening.
As for whether you should apply glycolic acid morning or night, we recommend applying it as part of your evening skincare routine. Glycolic acid can cause “photosensitivity,” which means it makes your skin more sensitive to the sun's UV rays, upping your chances of a sunburn or skin damage.
Niacinamide & Salicylic Acid
Niacinamide, a water-soluble form of vitamin B3, and salicylic acid, a beta-hydroxy acid, work particularly well when combined together. Both have anti-aging and anti-acne effects and offer some level of UV protection.
Can niacinamide and salicylic acid be used together? The simple answer is yes. They complement each other well. Being oil soluble, salicylic acid can penetrate deeper into the skin layers, but it can also dehydrate and irritate skin.
It is considered the best idea to apply niacinamide before salicylic acid. This is because the humectant traits of niacinamide ensure the natural skin barrier contains the correct levels of water. When the skin barrier is moisturised and healthy it can keep itself protected from exposure to free radical damage.