Yes, you can take Genacol to relieve knee pain. However, it is important to note that the effectiveness of Genacol is uncertain due to the low amount of collagen in the tablets. An alternative option would be to consider taking glucosamine sulfate capsules, which are a natural component of joints and have some studies supporting their effectiveness. It is recommended to take 500 mg three times a day. It may take 2-6 weeks to experience the effects, which is typically faster than Genacol.