DIY Rosemary Scalp Serum: A 3-Ingredient Recipe

Shop scalp serums cost a fortune and hide their actives behind a long ingredient list. You can make a clean, effective one in five minutes with three things.

What you'll need

• 2 tablespoons castor oil (the conditioning base)
• 8–10 drops rosemary oil (the scalp active)
• 5 drops peppermint oil (a cooling, clarifying boost)

How to make it

Combine everything in a small dropper bottle (a clean, amber glass one is ideal) and shake. That's a about a 2–3% essential-oil dilution — safe for the scalp. Label it and store away from light.

How to use it

Part your hair and apply a few drops directly to the scalp, not the lengths. Massage in for two to three minutes. Leave 30 minutes or overnight, then shampoo. Use two to three times a week.

Patch test first

As with any new blend, dab a little on your inner forearm and wait 24 hours before using on your scalp.

Three pure oils, one effective serum. Build it from Asuka's oils → and read the method in our rosemary hair guide.

Related reading

• Rosemary Oil for Dandruff and an Itchy Scalp
• The Ultimate DIY Soothing Skin Oil: Castor Oil, Batana Oil, Eucalyptus Oil & Rosemary Oil
• 5 Rosemary Oil Mistakes That Stall Your Hair Results
• Batana vs Castor, Rosemary and Argan: Which Hair Oil Is Right for You?
• Castor and Rosemary Oil for Hair: How to Blend Them Into One Routine