Dr Lynese Lawson in VA has been prescribing LDN for years along with HRT. She has fibro and ai patients who seem to benefit from it. There also appears to be some benefit for chronic pain patients who cannot tolerate, or have built a non-responsive tolerance, to opiods. Dr Lawson is among a handful of HRT specialists who also use LDN for some patients who may find a benefit
I do not think there would be any contraindication or reduction of benefit in using both treatments concurrently.