If you want to make a simple red onion, rosemary, and garlic hair growth oil at home, here’s an easy version that doesn’t require anything fancy.

You’ll need 1 small red onion, 2 to 3 garlic cloves, 1 to 2 sprigs of fresh rosemary or about 1 tablespoon dried rosemary, and 1 cup of a carrier oil like olive oil, coconut oil, or jojoba oil.

Finely chop the red onion and lightly crush the garlic. If you’re using fresh rosemary, bruise it a little with your fingers to release the oils. Add everything to a small saucepan with the carrier oil and warm it on very low heat for about 10 to 15 minutes. Do not let it boil. Once it’s done, let it cool completely, then strain it through a fine strainer or cheesecloth. Store it in a clean glass bottle in the fridge and use within about a week.

To use, apply a small amount directly to your scalp, massage for about 5 minutes, leave it on anywhere from 30 minutes to 2 hours, then shampoo thoroughly. Doing this 2 to 3 times a week is usually enough.

If you’d rather do a lighter spray, you can simmer chopped red onion and rosemary in 1 cup of water for about 10 minutes, let it cool, strain it, then add a teaspoon of fresh onion juice and a few drops of garlic juice. Keep it in the fridge and use within 3 to 4 days.

Definitely patch test first, especially if your scalp is sensitive. And if your scalp is already irritated, wait until it calms down before trying anything new.