Gallai gweithlu'r GIG, y cyflenwad o feddyginiaethau ac ymchwil feddygol oll gael eu bygwth gan Brexit, yn ôl rhybudd gan yr Ysgrifennydd Iechyd, Vaughan Gething.
The NHS workforce, supply of medicines and medical research could all be threatened by Brexit, Health Secretary Vaughan Gething has warned.