1. Check the Label
   Ensure the bottle clearly states "100% Pure Castor Oil" without any additives.

2. Cold-Pressed vs. Refined
   Opt for cold-pressed castor oil as it retains more nutrients compared to refined versions.

3. Organic Certification
   Look for organic castor oil to ensure it is free from pesticides and chemicals.

4. Packaging
   Choose dark glass bottles to protect the oil from light, which can degrade its quality.

5. Source of Origin
   Research where the castor beans are sourced from. India is known for high-quality castor oil.

6. Expiration Date
   Check the expiration date to ensure you’re purchasing a fresh product.

7. Reputation of the Brand
   Look for brands with positive reviews and a solid reputation in the market.

8. Price Point
   Be wary of overly cheap options; high-quality castor oil often comes at a reasonable price.

9. Allergens and Sensitivities
   Confirm that the product is free from common allergens if you have sensitivities.

10. Patch Test
    Before large-scale use, do a patch test to check for any allergic reactions.

By considering these factors, you can ensure you're making an informed choice when purchasing castor oil.