Tea tree shampoo can be beneficial for hair due to its antifungal and antibacterial properties. It may help with dandruff, itchy scalp, and promoting a healthy scalp environment for hair growth.

Tea tree shampoo should be avoided if you have sensitive skin or a known allergy to tea tree oil or related plants. Also, avoid use on children without consulting a doctor as their skin may be more sensitive.

Some tea tree shampoo lawsuits have involved claims of allergic reactions, skin irritation, or hair loss. It's important to research specific brands and read reviews before purchasing to be aware of any potential issues.

Potential side effects of tea tree oil shampoo include skin irritation, redness, itching, or dryness, especially if the concentration of tea tree oil is high. Discontinue use if you experience any adverse reactions and consult a dermatologist.