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John R. Lee (1929-2003), USA.

With his book "Progesterone, a remarkable hormone" he established a new understanding of hormone therapy.

Unlike traditional hormone replacement therapy, the aim here is to balance the hormone levels measured in the laboratory and only natural hormones are used. For example, progesterone is used and not the hormone- like progestogen.

In Germany, this approach is called bioidentical hormone therapy. Dr. Leithoff is trained in this procedure.

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