Gary Moller comments:
To relate Dr Cannell's recommended levels to the usual NZ blood tests, here is the information you need.We have known for years that vitamin D deficiency in the elderly leads to muscle and bone weakness and poor cognitive performance that results in poor balance and stumbling, dementia and so on. It is therefore little surprise that boosting an athlete's vitamin D levels to optimum will bring about an imtprovement in strength, speed, agility, concentration and stamina. It also stands to reason that such athletes are more resistant to injury by having stronger bones and muscles.
To date, not a single sports person (Or anybody else for that matter) who has consulted me about a chronic health or injury problem has returned a blood test for vitamin D that is anywhere near optimum.
If you are in serious training and if you want to produce your best and most consistent performances then it makes such good sense to boost your vitamin D levels to optimum and then to keep it there year round. Here is one of the most important nutritional supplements and it is completely free!