There are many hair growth oils available, and some oils have research to back potential hair growth benefits. Doctors may recommend oils that contain certain ingredients that nourish the scalp and prevent scalp infections, protect the hair shaft from breaking, and act as a conditioner, mask, or oil treatment. Here are some of the best hair growth oils recommended by doctors, along with their positive and negative aspects and ingredients:

1. Rosemary oil: This oil is great for stimulating hair regrowth, increasing circulation, and promoting a healthy scalp. It also has anti-inflammatory and anti-fungal properties.

2. Peppermint oil: This oil has been shown to increase hair thickness, number of hair follicles, and overall hair growth.

3. Lavender oil: This oil has been shown to promote hair growth and prevent hair loss.

4. Almond oil: This oil is rich in nutrients and antioxidants, promotes hair growth, and makes hair strong. It is also a good oil for hair growth due to the presence of vitamin E and fatty acids.

5. Sesame seed oil: This oil is used as a secret ingredient in many ayurvedic preparations for hair growth. It is rich in omega-6 fatty acids, which are essential for hair growth, and has phytosterols, a compound that blocks the action of hormones that leads to hair loss. It is highly penetrative and heals internal damage by infusing deeper nourishment.

6. Argan oil: This oil repairs damaged hair, hydrates, moisturizes, and nourishes the hair shaft deeply. It is considered one of the best ingredients for healthy hair.

7. Coconut oil: This oil is rich in fatty acids that penetrate the hair shaft and reduce protein loss from hair. It also has antimicrobial properties that protect the scalp from infections.

8. Castor oil: This oil is rich in ricinoleic acid, which has anti-inflammatory and antimicrobial properties. It also contains omega-6 and omega-9 fatty acids, which nourish the hair and promote hair growth.

It is important to note that while hair growth oils can have many benefits, they may not work for everyone. Some oils may cause allergic reactions or scalp irritation, and some synthetic ingredients can be drying to the hair. It is best to consult with a doctor or dermatologist before using any hair growth oil.