The downsides of retinol include possible side effects and precautions to consider when using this skincare ingredient. Common issues with retinol are: Skin Irritation: Retinol can cause dryness, redness, peeling, and itching, especially at first. These side effects might lessen as your skin adjusts. Sun Sensitivity: Retinol can make your skin more sensitive to the sun, increasing the risk of sunburn. Always use sunscreen and limit sun exposure when using retinol. Overuse: Using too much retinol can lead to dryness, redness, and peeling. Follow recommended guidelines and consult a skincare professional if needed. Health Consequences: Taking too much oral retinol can cause health issues like nausea, vomiting, headaches, and dizziness. Use retinol products as directed and do not ingest them. Skin Adjustment Period: Some people experience a period of increased sensitivity or purging when they start using retinol. Be patient and allow your skin to adapt. Overall, while retinol offers great skin benefits, it's crucial to be aware of the downsides and take necessary precautions for safe and effective use.