The lemon oils market is hugely saturated and there are a number of different types of product you can purchase, with some being safe to consume and others being dangerous.
If the product in question is something like an olive oil that has been flavored with lemon, then it should be perfectly safe for you to use in cooking. Just be prepared for the oil flavor to come through equally as strong or sometimes even stronger than the lemon taste itself.
It’s recommended that you do not ingest lemon oil directly, and that instead, you should dilute it.
Oil-based lemon extracts are also safe for human consumption.
However, not all lemon oils are safe for humans to eat so we recommend always checking the bottle first to make sure. Aromatherapy oils, for example, are not safe for consumption.