I think having a bone marrow biopsy is pretty extreme. What is your exact lymphocyte count? I don't plan on doing anything like that. Low white blood cells can be hereditary. That doesn't mean you can't do anything about it, I think there are things you can do to help boost function and keep steady levels. The only other "natural" way to boost wbc is to actually catch a cold or get sick. Then the body will naturally produce more to fight off infection.