I understand that DHEA is available through some compounding pharmacists in Aussie. It is not natural (as in herbal) but is in a natural form (same molecular structure as the DHEA your body would make). If you contact Pathlab in Melbourne they would be able to tell you where to go. Their details are
68 Burwood Hwy, Burwood Vic 3125 Ph: 03-8831 3000