A konjac sponge consists only of konjac flour and water, but contains many valuable vitamins and minerals:

water
protein
carbohydrate
lipids
sodium
potassium
magnesium
iron phosphorus
copper
zinc
vitamin A
vitamin E
vitamin D
vitamin B1
vitamin B2
vitamin B6
vitamin B12
vitamin C
pantothenate
niacin
fatty acid
folic acid