My ceramics are made with entirely food safe materials. Although Stoneware is strong and durable enough to withstand the dishwasher, its glaze will be forever grateful and glossy if hand washed and treated with care. Microwave safe? The jury is out. I’ll reheat a ceramic mug of coffee or a plate of food for a few minutes without issue, but would be reticent to cook in the microwave over extended time. As with any vitreous ware, avoid extreme temperature fluctuations.