Salicylic acid is a beta-hydroxy acid (BHA) used in skincare to exfoliate skin, unclog pores and reduce breakouts. Originally derived from plants like willow bark, it is oil-soluble, which means it can slip into pores and clear out the dirt, excess oil and dead cells that lead to blackheads and pimples. Azlok's Salicylic Acid (chemical formula C7H6O3, CAS 69-72-7) is a fine white powder meant for external, cosmetic and formulation use.
What Salicylic Acid Is Used For
Because it works differently from water-soluble acids like glycolic acid, salicylic acid is a favourite for oily and acne-prone skin. Its oil solubility lets it penetrate the sebum inside a pore rather than sitting on the surface.
- Acne and blackhead care: helps loosen clogged pores and reduce the formation of comedones.
- Gentle exfoliation: dissolves the bonds between dead skin cells, leaving skin smoother.
- Oil control: useful in face washes, toners and spot treatments for combination and oily skin.
- Formulation ingredient: used by small skincare makers in serums, cleansers, masks and body washes.
- Antiseptic and preservative applications: it also has recognised uses in industrial and preservative contexts.
How to Use It in DIY Formulations
Salicylic acid powder is potent, so the concentration matters more than anything else. In leave-on skincare products it is typically used at around 0.5% to 2%, while rinse-off cleansers may go slightly higher. If you are new to formulating, start low.
- Dissolve it first. Salicylic acid is poorly soluble in plain water. Many formulators dissolve it in a small amount of ethanol, or use it in the presence of solubilisers before adding to the water phase.
- Weigh, don't scoop. Use an accurate scale. A 2% serum means 2 grams of powder per 100 grams of finished product.
- Check the pH. Salicylic acid works best in a slightly acidic formula, usually around pH 3 to 4.
- Patch test the final product on your inner arm for 24 hours before applying to the face.
Because 100 g goes a long way at these low percentages, even the smallest pack lasts a while for home use, while the larger 5 Kg to 25 Kg packs suit small businesses producing regularly.
Safety and Handling
This is a cosmetic raw ingredient, not a finished product, so treat it with respect.
- External use only. Do not ingest it.
- Avoid the eyes and any broken or irritated skin. If contact occurs, rinse with plenty of water.
- Wear a mask and work in a ventilated area when handling the loose powder, as fine dust can irritate the airways.
- Introduce it slowly on skin. Start with a couple of times a week and build up; overuse can cause dryness, flaking or stinging.
- Keep it away from children and label your containers clearly.
- Sun sensitivity: exfoliating acids can make skin more sensitive to sunlight, so use sunscreen during the day.
- Pregnant or breastfeeding users and anyone with sensitive skin should check with a doctor before use.
Buying and Storage Tips
Look for a white, dry, free-flowing powder with a stated shelf life — Azlok lists 24 months when stored correctly. Keep it in a tightly sealed, airtight container, away from heat, direct sunlight and moisture. Store it in a cool, dry place. If you buy a larger pack, decant a small working quantity into a separate jar so you are not repeatedly opening the main container and exposing it to humidity. Always ask for the COA and MSDS if you are formulating for sale, so you know exactly what you are working with.
FAQ
Is salicylic acid good for acne?
Yes. It is oil-soluble, so it penetrates pores to clear out oil and dead skin, which helps reduce blackheads and breakouts. It is a common active in acne cleansers and spot treatments.
What percentage of salicylic acid is safe for skin?
In home and cosmetic use, leave-on products usually contain 0.5% to 2%. Start at the lower end, use it a few times a week, and increase gradually while watching for dryness or irritation.
Can I dissolve salicylic acid in water?
Not easily — it has low water solubility. Formulators typically dissolve it in a little ethanol or use appropriate solubilisers before blending it into the rest of the formula.
Can salicylic acid be taken internally?
No. This raw ingredient is meant for external, cosmetic and formulation purposes only. Do not ingest it, keep it away from the eyes, and store it out of reach of children.
How should I store salicylic acid powder?
Keep it sealed in an airtight container in a cool, dry, dark place away from moisture and heat. Stored this way it keeps well within its 24-month shelf life.