When your back hurts you hurt all over. I have had so much pain in my lower back today I want to cry (and already have several times). Your BF need to do some gentle detoxing however. I suggest he begin with a gentle herbal liver cleanser like Liver Essentials from http://swansonvitamins.com,
or an excellent product called Liv52. Also helpful would be for him to drink at least two glasses of lemon water everyday to help cleanse his kidneys. That is one 8-10 ounce glass of pure, not tap, water with the juice of one fresh lemon in it. The liver and kidneys help filter toxins from the blood. As the blood becomes cleaner, it will continue to absorb toxic waste from the organs and tissue. This slower more gentle detox should not affect his back problems, but will give him a start. A toxic body is slow to heal; and this can include back injuries. When he feels better, oil pulling, Colon Cleanses and Liver Flushing will be good options, but for now he probably needs to start slowly.