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Onion oil has become one of the most popular natural remedies for hair fall and thinning hair. Backed by traditional Ayurvedic wisdom and supported by emerging scientific research, this pungent kitchen staple has found its place in hair care. But how does it actually work? And can adding rosemary oil make it even more effective? Let’s break it down.

What Makes Onion Oil Effective for Hair Growth?

1. Rich in Sulphur Compounds

Onions are a rich source of organosulphur compounds, particularly alliin and allicin, which have been shown to:

• Boost keratin production

• Improve blood circulation to hair follicles

• Strengthen the hair shaft
  Sulphur is a vital building block of hair proteins and is believed to support hair regeneration.

2. Antioxidant Activity

Onions contain quercetin, a flavonoid with strong antioxidant and anti-inflammatory effects. This helps reduce oxidative stress on the scalp, a key contributor to hair fall and poor follicle health.

3. Anti-Microbial Properties

Onion oil may help fight fungal or bacterial scalp infections, creating a healthier environment for hair follicles.

4. Increased Collagen Production

Some studies suggest that onion extract stimulates collagen synthesis, which supports skin and scalp health.

Study Reference: A 2002 study published in the Journal of Dermatology reported that 74% of people who applied onion juice to their scalp twice daily saw visible hair regrowth within 4 weeks.

How to Make Onion Oil at Home

Ingredients:

• 1 cup coconut oil or sesame oil (as base)

• 2 medium red onions, grated

• Optional: 1 tablespoon fenugreek seeds (methi)

Method:

1. In a heavy-bottom pan, heat the base oil on a low flame.

2. Add grated onion and fenugreek seeds.

3. Simmer for 15–20 minutes until onions turn brown and aromatic.

4. Cool, strain, and store in a glass bottle.

This oil retains the sulphur compounds and antioxidant content of onions while being gentler on the scalp.

 Why Add Rosemary Oil?

Rosemary oil is one of the most well-researched essential oils for hair growth. Its benefits include:

1. Boosts Blood Circulation

Rosemary stimulates scalp circulation, ensuring more nutrients and oxygen reach hair follicles, which encourages new growth.

2. DHT Blocker

Some studies indicate rosemary oil can block DHT (dihydrotestosterone), a hormone responsible for male and female pattern hair loss.

3. Enhances Hair Thickness

Regular use has been linked with improved hair density and thickness, comparable to the effects of minoxidil in some trials.

Study Reference: A 2015 study in SkinMed showed that rosemary oil was as effective as 2% minoxidil in treating androgenetic alopecia over 6 months — with fewer side effects.

How to Use Onion and Rosemary Oil Blend

For Best Results:

1. Warm a few tablespoons of onion oil.

2. Add 2–3 drops of rosemary essential oil (do not exceed 5 drops per tablespoon).

3. Massage into scalp for 5–10 minutes using circular motions.

4. Leave for at least 2 hours or overnight.

5. Wash off with a mild, sulphate-free shampoo.

Frequency: Use 2–3 times a week for at least 3 months.

Safety Notes

• Always do a patch test before first use to rule out sensitivity or allergies.

• Essential oils like rosemary should never be applied directly to the scalp without dilution.

Bottom Line

Onion oil isn’t a miracle — it’s a natural, sulphur-rich elixir that works over time by strengthening follicles, improving blood flow, and fighting inflammation. Pairing it with rosemary oil enhances these effects and may even mimic the benefits of pharmaceutical treatments, without the side effects.

For anyone seeking a science-backed, plant-powered solution to hair fall, this combination is a smart, affordable place to start and fits perfectly with Satthwa’s commitment to thoughtful, natural care.