Rosemary Onion Scalp Serum
A pungent pre-wash oil: onion juice for its sulphurous bite, coconut oil to soften a scalp that feels tight, and a little rosemary to make the whole thing bearable.
You will need
- 2 tbsp onion juice, strained
- 1 tbsp coconut oil
- 3 drops rosemary oil
- 1 tsp aloe vera gel
The ritual
- Blend one small onion, then press the pulp through a fine sieve or muslin.
- Warm the coconut oil until just liquid, then whisk in the onion juice and aloe.
- Add the rosemary oil off the heat and stir once more.
- Part the hair in sections and dab along the scalp with cotton wool.
- Leave 30 minutes, then shampoo twice; the second wash is what clears the smell.
Why these ingredients
- 2 tbsp onion juice, strained
- The heart of the ritual and the reason it smells. Straining well is what keeps it from turning into a gritty mess.
- 1 tbsp coconut oil
- Carries everything, coats the hair shaft so combing is easier afterwards, and softens a scalp that feels tight and flaky.
- 3 drops rosemary oil
- Three drops is a sensible dilution at this volume. It cuts the onion smell and gives the serum a clean herbal edge.
- 1 tsp aloe vera gel
- Adds slip and a little water so the mix spreads along the parting instead of pooling in one greasy spot.
Easy swaps
- 2 tbsp onion juice, strained → shallot or red onion juice, same method, slightly milder smell.
- 1 tbsp coconut oil → olive or castor oil if coconut leaves your hair stiff.
- 3 drops rosemary oil → peppermint oil at the same three drops, or leave it out in pregnancy.
- 1 tsp aloe vera gel → a teaspoon of strong green tea, cooled.
Keep it clean
Mix with freshly washed hands and clean, dry bowls and spoons. If a recipe is stored, use a jar or bottle washed in hot soapy water and dried completely, and never dip wet fingers into the batch.
Storage & when to let go
Keep refrigerated in a lidded jar and use within three days. Onion juice turns quickly and you will know when it has.
What to expect — honestly
Hair feels softer and looks shinier after the wash, and the scalp feels less tight. Any change is to how the hair looks, not to how much of it there is. The smell is real, so do this on a night you are staying in.
Common questions
Will this make my hair grow?
We are not going to promise that. What you will notice is a scalp that feels less tight and hair that looks glossier once the oil has washed out.
How do I get rid of the smell?
Shampoo twice, then rinse with cool water and a splash of well diluted apple cider vinegar. Most of it goes, though a faint trace can linger until the next wash.
This recipe is shared for general cosmetic enjoyment, not medical advice — see how we research and write in our editorial policy and the full safety guide.
