Our expert says:
I don't think this is yet an established, reliable and available test --- at least, not as far as I've heard, in SA. Although the relevance of specific genes is being explored, no single widely agreed cause has yet been identified. And though the sellers of ginko biloba may want us to believe it has preventive powers, there is NO good evidence to support that suggestion. Unfortunately, it's not hard for commercial enterprizes to find a "medical professional" to make enthusiastic noises about new products, not necessarily based on fine scientific evidence
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