Your body undergoes its natural repair process while you're asleep, and the vitamin C will make its strongest impact on your skin during this time. It'll also absorb into your skin most effectively after you've cleansed and exfoliated, so it makes sense to apply it during your nighttime routine.
Limit to Two Serums Per Routine
We recommend you use no more than two face serums per routine. Again, alternating skin care items is a strategy here. If you have many serums that you like, use one or two in your morning routine and two different serums in the evening.
While you should apply serum twice a day, you shouldn't be using the same formulation. "Serum actives differ for day and night," says Rabach. During the day, she likes to choose serums with antioxidants that protect skin from daytime stressors like free radicals (caused by UV rays), pollutants, and blue light.
Look out for formulas that contain Hyaluronic Acid, one of the most common ingredients found in hydrating serums. Hyaluronic Acid – also known as Sodium Hyaluronate – is a powerful humectant that attracts and binds moisture to the skin, to keep it plump and hydrated. Glycerin and Aloe Vera are also potent hydrators.
Generally, though, you can safely use hyaluronic acid both morning and night.
Yes! It is completely okay to mix two serums together, or even more. However, there are a couple of guidelines to abide by when mixing. Firstly, you need to mix each serum in the palm of your hand before applying to your face.
Not only can you use vitamin C and hyaluronic acid together, but when you do, they can help create a more effective skincare routine. Each one has skincare benefits, some of which we mentioned, but when combined, they can form a more potent formula that offers increased results.
Order Matters: Serums are applied after cleansing and toning and before your moisturizer. If you don't use toner, then apply serum directly after cleansing. Keep It Simple: It's best to layer no more than two serums at a time. Too many layers can possibly prevent the ingredients from absorbing as effectively.
For maximum absorption, serums should be applied to freshly cleansed skin. Apply the thinnest facial serum first, or, if serums are the same consistency, start by addressing your primary skin concern. Massage a few drops into the skin, then wait until absorbed before applying your secondary serum.
Hyaluronic acid should be layered before retinol in case of dry or sensitive skin, as it helps create a barrier between retinol and your skin, offsetting irritation. Must-mention: let your hyaluronic acid serum dry before following with retinol as, if applied to damp skin, there's a higher risk of redness and dryness.
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.
There's no problem with using both retinol and vitamin C as part of your skincare routine, dermatologists say. In fact, Shirazi calls this combo a "power couple" when it comes to aging well.
When should I use hyaluronic acid? While some skincare ingredients, like retinol, are best used at night and others, like vitamin C, work their magic in the daytime, hyaluronic acid can be used both morning and night. “I recommend use of an HA serum up to twice daily, depending on your skin's needs,” says Abdulla.
“Hyaluronic acid plays well with most ingredients, while caution must be taken when using retinol in combination with alpha hydroxy and beta hydroxy acids, benzoyl peroxide, and some types of vitamin C.” Linkner echoes the tip about avoiding vitamin C.
Don't Mix: Retinol with vitamin C, benzoyl peroxide, and AHA/BHA acids. AHA and BHA acids are exfoliating, which can dry out the skin and cause further irritation if your skincare routine already includes retinol.
“The order of application is incredibly important,” says Dr. Rogers. “The skin's job is to keep things out, but many of the skin care products we use have ingredients we want to get in. Only a very small amount of these key ingredients can penetrate the skin, even when perfectly formulated and perfectly applied.
While there is no limit to how many serums you can add to your regimen, esthetician Enrique Ramirez, founder of Face to Face NYC, suggests stopping at three. Piling on more products than that is not only time-consuming, it also reduces the chances of each ingredient getting properly absorbed by your skin.
The reason why people suggest a maximum of two or three serums comes down to layering and penetration. Heaps of brands, salons and experts recommend leaving time between applying your serums and moisturisers, and doing it in a specific order so as to allow all of the ingredients to actually sink into your epidermis.
Goldenberg's go-to recommendation for timing between serums and moisturizers is about one minute. This wait has the same reasoning: Sixty seconds — give or take — gives each product a moment to delve into your pores.
Serum. A pea-sized amount of serum gives your skin a concentrated boost of ingredients that help with hydration, exfoliation, acne, or dull skin. If you use too much: Using too much of any product leaves active ingredients sitting on your skin. Some, such as exfoliating serum, can lead to stinging or peeling.
About 3-4 drops of the face serum are enough to lightly cover your entire face.
Wait, then Moisturize Serums are not moisturizers.
To allow serums to fully absorb, apply and wait 5 minutes before moisturizing. Take note: Well-formulated serums absorb quickly and disappear into your skin. If they leave an oily or sticky residue, they're not doing their job well.