Yes, Revlimid does contain lactose, but the amount is usually not enough to cause symptoms like those from consuming dairy products. It is generally not necessary to take Lactaid to avoid symptoms with this medication. You should be able to take vitamin B12 or other natural products with Revlimid, but it is important to consult with your doctor or pharmacist to ensure that there are no interactions that could affect your liver. Regular monitoring and blood tests may be needed while taking Revlimid to assess any potential risks or side effects. Always consult with a healthcare professional before combining medications or supplements.