Warnings - Grapefruit oil can cause photosensitivity. If you use it on your skin, avoid exposure to the sun or sunbeds for 12 hours. Lemon oil can cause photosensitivity. If you use it on your skin, either use a steam distilled lemon oil (which doesn't cause photosensitivity) or dilute to 2% or less or avoid exposure to the sun or sunbeds for 12 hours. Do not apply peppermint oil on or near the face of infants and children. Peppermint oil is best avoided during pregancy and while breastfeeding.