Hibiscus (Hibiscus sabdariffa) is high in vitamin C, which aids iron absorption, Hibiscus is best combined with herbs high in iron. It is also normalizing for blood pressure. One to three cups a day is an average amount to drink. Since you have low blood pressure and thrombophilia, it would be best to not consume more than that. It is also best to let your doctor know all the supplements you are taking. Hibiscus tea may be a good option for men who have nutritional deficiencies, weakened heart or circulatory issues that may be contributing to lowered fertility, but Hibiscus alone will not resolve fertility issues.