I don't understand the point you're trying to make. Yes, GnRH blockers will affect bones in adulthood, that's exactly why they're used to make kids taller, beca

I don't understand the point you're trying to make. Yes, GnRH blockers will affect bones in adulthood, that's exactly why they're used to make kids taller, because they give more time for bones to develop. This is, of course, an unintended effect in the context of transgender healthcare, but it's fairly benign. Gender affirming hormones, such as estrogen, do cause osteoporosis - that's why women are more prone to osteoporosis than men. Puberty blockers have not been linked to osteoporosis in pre-pubescent patients, despite more than 40 years of use. GnRH blockers are however dangerous in adults because you need adult level of sex hormones for your bodily function and as such are generally not used for an extended period of time - in pre-pubescent children however it moreso prevents their increase from puberty than it suppresses current levels. This is because GnRH is not produced in significant quantities before puberty, so suppressing it further has far fewer side effects.