cpk is the residue of cell usage.
creatine phosphokinase (CPK)
www.drmirkin.com/fitness/1346.html
basically, the fuel cells use to create energy when you exercise is burnt and like say coal, there is a residue. the older we get the more residue is created as cells burn less efficiently but also the harder we train/exercise or do more than we are used to results in a build up of CPK which ''clogs'' the system therefore not allowing proper ion and nutirnet exchange across the cell membrane, (if you leave coal ash in the grate, after a while you cannot light another fire as the ash is too great???)
the link above explains the difference between lactic acid build up and removal to CPK build up and removal.
very little is written about CPK for the layman and even less about its removal from the body.
personally I use MSM, methyl sulphonyl methane. I have hypothyroidism which oftens leads to increased levels of CPK. normal for a woman is around 140 and for a man 180. mine has been as high as 1100 but only as low as 280 over the last 5 years. MSM is a natural sulphur based nutrient, it is needed by the body for joint and muscle health. it is a constituent of joint tissue and can help to alleviate joint pain and is often taken with glucosamine by people with arthritis. MSM also appears to help remove toxic wastes like CPK. My endocrinologist and I did an 'experiment' a few years back. I took 3000mg of MSM for 6 months and my CPK levels plummetted from 927 to 280, after this blood test, I stopped taking MSM for 3 months and my CPK levels went back up to 690. my endo is still investigating this he says!! magnesium seems to help too, it is the relaxer compared to calciums constrictor so when you flex a muscle, calcium is used to contract and magnesium is then used to relax, by having a magnesium rich diet, this does appear to help toxic removal as well but not sure how but possibly by allowing more blood to the area and more blood means more ability to take more toxins away. more blood to a sore muscle also aids recovery by providing nutrients needed. strangely enough I reccommend MSM to people who quit smoking as it not only appears to reduce cravings but mainly helps the lungs recover by aiding toxin removal
I can't give any more detailed advice really as I am not allowed to by law, but if you think you will struggle somewhat with training then a sports nutritionist may be what you need. they can advise on ATP, ADP, creatine intake, protein etc etc etc.
I am not sure how many qualified herbalists on the books of the NIMH are sports trained, but it may be worth a look on their site www.NIMH.org.uk for your nearest herbalists and look out for what they are experienced and qualified in. if you don't see what you want, e mail NIMH direct and ask if they can reccommend someone in your area. alternatively www.nutripeople.co.uk/ don't know much about these even though one of my quals is in sports nutrition but maybe worth a look if NIMH does not produce!!
hope thats useful for you?