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The concept of embryo toxicity as an immune issue is an hyptothesis which is really nit proven. At least the results have not been reproduced by any other investigators. Actually. for progesterone to act like cortisol, or a related steriod, you would need far more than you are receiving as supplementation in any protocol I know. You are correct that progesterone injections provide a higher blood level than vaginal progesterone. Vaginal progesterone does provide excellent levels in the endometrium, where you want it. Good luck.
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