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Murmura Encyclopedia

In pursuit of the truth behind what is in our skincare products, Murmura has debunked cosmetic ingredients and treatments. Providing all of the information you need to make informed decisions when choosing a product that’s right for your skin.



What are they?

Beta Hydroxy Acids are found in willow bark and are most commonly known as Salicylic Acid. They have anti-inflammatory and antibacterial properties that target blackheads and acne prone skin. 

BHAs are a secret weapon for your skin due to their oil-soluble qualities, allowing them to penetrate deep into your pores and dissolve the oil that’s blocking them.

What are they used for?

BHAs in skincare are used to fight acne and blemishes, they also work to reduce excess oil on your skin. It enables a deep exfoliation of both the skin’s surface and deep into your pores as it’s able to penetrate the skin.

They should be applied to clean skin after cleansing, begin by using once every two – three days per week. You can then start gradually increasing usage to every other day with the aim to adapt your skin to the BHA and build a tolerance.

Use BHA formulas with low (1% - 3%) strengths for gentle application at home.


Improving uneven skin tones, getting rid of fine lines and preventing breakouts are a few of the core benefits that BHA products can achieve. Don’t be put off by the ‘acid’ in its name – AHAs and BHAs can be more gentle for your skin than a common scrub exfoliator.

They facilitate the removal of dead skin cells on the surface, promoting the growth of new, healthy skin beneath. 

Similar to AHAs, BHAs can make your skin more sensitive to sun damage, so it’s key to always use an SPF after use.

Found in?

BHA is found in cleansers, masks and washes so now it’s time to find one that works for you.

For your fix try, Cosrx's Natural BHA Skin Returning A-Sol, which uses a light form of BHA called Betaine Salicylate.