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Because normal hormone baselines vary drastically between different people, a single blood test offers very little clinical value

Having too much or not enough can cause serious symptoms and may be a sign of another condition

The author DK declared that they were an editorial board member of Frontiers, at the time of submission

The risk is simply not worth the unproven, short-term gain. The UK regulatory body for medicines, the Medicines and Healthcare products Regulatory Agency, told The Independent that it disregards claims that these products are for research purposes if it is clear that such claims are being used in an attempt to avoid regulations