Actives 101: Which One Does YOUR Skin Actually Need?

All over social media, everyone is talking about what products their using and which one is “THE HOLY GRAIL PRODUCT” but none of these people have YOUR skin. So heres a deep dive into the most talked about actives and if they’re right for your skin needs.

Before starting any actives, you want to make sure your barrier is healthy and that you’re not adding too many actives into your weekly routine. Over exfoliation can lead to damaged barrier, stingy, burning, reactive skin or acne. Actives are some of my favorite tools in skincare, but choosing the right one is much more important than simply using the strongest product you can find.

Here are four you’ll commonly see and when I might reach for each one.

Mandelic Acid

Mandelic acid is an alpha hydroxy acid (AHA) that can be especially useful for acne, congestion, texture, and post-inflammatory hyperpigmentation.

One of the things that makes mandelic acid interesting is its larger molecular size compared with glycolic acid. Because of its larger molecular structure, it tends to penetrate the skin more slowly, which can make it a more approachable exfoliating acid for certain acne prone, sensitive, or pigmentation prone clients.

If your skin is: acne prone, easily inflamed, experiencing clogged pores, or left with dark marks after breakouts, mandelic acid may be a great active for you. I especially like it when we're trying to address acne and pigmentation at the same time.

A product I love: Face Reality Mandelic Serum 5%

A 5% mandelic serum can be a great introduction to an exfoliating active, but frequency should still be determined by your skin's tolerance and the rest of your routine.

Salicylic Acid

Salicylic acid is a beta hydroxy acid (BHA), and what makes it different from AHAs is that it is oil-soluble.

That makes salicylic acid particularly useful for oily, congested, and acne-prone skin because it can work within the oil rich environment of the follicle. It helps loosen and remove buildup while also having anti-inflammatory properties.

If your skin is: oily, congested, prone to blackheads and clogged pores, or you constantly feel like your pores refill no matter how much you cleanse, salicylic acid may be a good choice for you.

I tend to reach for salicylic when oil and follicular congestion are a major part of what we're trying to address.

A product I love: DMK ACU Mist

This mist is great to spray throughout the day, if you’re prone to acne, after a sweaty workout, or even if your skin tends to feel oily at the end of the day.

Glycolic Acid

Glycolic acid is also an AHA, but it behaves differently from mandelic acid.

Glycolic acid has a smaller molecular size than mandelic acid, allowing it to penetrate quicker and stronger into the skin. This can make it a very effective option for concerns such as uneven texture, dullness, fine lines, and hyperpigmentation.

However, faster penetration can also mean a greater potential for irritation depending on the concentration, pH, formulation, frequency of use, and condition of your skin barrier.

If your skin is: dull, rough or uneven in texture, showing signs of sun damage, or you're primarily concerned with fine lines and uneven pigmentation, glycolic acid may be an active worth incorporating.

If your skin is currently very inflamed, sensitized, or experiencing an impaired barrier, however, glycolic may not be where I would start.

Benzoyl Peroxide

Benzoyl peroxide is a little different because it isn't an exfoliating acid.

Benzoyl peroxide is primarily used to treat inflammatory acne. It works by releasing oxygen within the follicle, helping reduce Cutibacterium acnes, one of the bacteria involved in acne development.

If your skin is: experiencing red, inflamed pimples, pustules, or persistent inflammatory acne, benzoyl peroxide may be one of the most useful actives in your routine.

This is an important distinction: if your primary concern is blackheads and congestion, I might think about salicylic acid. If you're dealing with red, inflamed acne lesions that hurt, benzoyl peroxide may make more sense. And sometimes an acne routine may strategically incorporate both.

A product I use: Face Reality Acne Med 2.5%

Face Reality offers Acne Med in different benzoyl peroxide strengths, which allows the routine to be adjusted based on the client’s acne and skin tolerance rather than automatically starting with the highest percentage.

And What About Vitamin A?

Vitamin A deserves its own category because it works differently from the acids above.

Rather than simply exfoliating the surface of the skin, vitamin A derivatives influence processes involved in cellular turnover and skin renewal. Depending on the formulation, vitamin A can be useful for concerns including acne, pigmentation, texture, and visible signs of aging.

If your skin is: experiencing uneven texture, signs of aging, persistent congestion, sun damage, or uneven pigmentation, a vitamin A product may be an important part of your long-term routine.

A product I love: DMK Revitosin

Vitamin A is also something I prefer to introduce intentionally. More frequent or stronger application isn't automatically better, especially when someone is already using exfoliating acids.

Why Molecular Size Matters

An ingredient’s name or percentage doesn't tell us the entire story.

Our skin is designed to keep substances out. For an ingredient to reach its intended target, factors such as molecular size, solubility, concentration, pH, formulation, and the condition of your skin barrier all matter.

Mandelic acid has a larger molecular structure than glycolic acid, contributing to its slower penetration. Glycolic acid's smaller molecular size allows it to penetrate more readily. Salicylic acid is oil-soluble, which allows it to move through the oil inside the follicle and makes it especially effective for addressing buildup in oily or congested pores.

This is also why two products containing the “same” active can feel completely different on your skin.

If you’re unsure what your skin needs, this is exactly what we can determine during a consultation at Sada. Your routine should be built around your skin, your concerns, and what it can currently tolerate.