Onion Juice vs. Castor Oil for Hair Growth – Which Works Best?
Updated: October 18, 2025
They’re like bounding together to give you shiny , silky , smooth , and healthy hairs! Who wouldn’t want that? Have you tried using them for hair care?
Why Compare Onion and Castor Oil?
Both onion juice and castor oil are popular natural remedies for hair growth. But which one actually works better? Let’s break down the science and benefits of each to help you choose the right remedy for your hair needs.
Benefits of Onion Juice for Hair
- Rich in sulfur → strengthens hair roots.
- Improves blood circulation to scalp → stimulates new hair follicles.
- Contains antioxidants → fights dandruff & scalp infections.
- Helps in reducing hair thinning & bald patches.
Benefits of Castor Oil for Hair
Best for people with hair fall, thinning, and bald spots.
- High in ricinoleic acid → deeply nourishes scalp.
- Natural anti-inflammatory → soothes itchy, flaky scalp.
- Improves hair thickness & shine.
- Provides a protective layer against breakage.
Best for people who want thicker, stronger, and moisturized hair.
Onion Juice vs. Castor Oil: Head-to-Head
| Onion Juice | Castor Oil |
| Regrowth & reducing hair fall | Moisture & hair thickening |
| Nutrients Sulfur, antioxidants Vitamin E, omega-6 | ricinoleic acid |
| Texture Watery, quickly absorbed | Thick, sticky, hard to wash |
| Best For Hair loss | bald patches Dry scalp, weak hai |
| Smell Strong odor | Mild but oily |
Can You Use Onion Juice and Castor Oil Together?
- ✅ Yes! In fact, mixing them creates a powerful combo remedy:
- Onion juice boosts circulation and regrowth.
- Castor oil locks in moisture and strengthens strands.
DIY Remedy:
1. Extract fresh onion juice (2 tbsp).
2. Mix with castor oil (1 tbsp).
3. Massage onto scalp for 10 minutes.
4. Leave for 1 hour (or overnight if scalp tolerates).
5. Wash with mild shampoo.
Use 2–3 times a week for faster and thicker hair growth.
Which One Should You Choose?
Choose Onion Juice if you want:
- Regrowth on bald patches
- To stop hair thinning
- Quick scalp circulation boost
- Silky and smooth texture
Tip: So to get rid of the smell of onion juice when using it with rosemary oil for hair care, you can use like 2 drops of rosemary oil . Rosemary oil's got a nice fresh scent that'll kind of help mask the onion smell . Easy peasy!
Choose Castor Oil if you want:
- Thicker, shinier strands
- To repair dry, brittle hair
- Long-term scalp nourishment
For best results, many people use both together in a combined hair mask.
FAQs
Q1: Which works faster, onion juice or castor oil?
Onion juice usually shows quicker results in 4–6 weeks, while castor oil strengthens and thickens hair over 6–8 weeks.
Q2: Can I mix onion juice and castor oil for hair growth?
Yes, the combination gives faster regrowth + thickness.
Q3: Which is better for bald spots?
Onion juice is more effective for bald spots because it stimulates new follicle growth.
Q4: Which is better for dandruff?
Onion juice fights fungal infections, but castor oil keeps the scalp hydrated. Both help differently.
Q5: Can I use both daily?
No, 2–3 times a week is enough. Daily use may irritate the scalp.
