Why is Guangyou Hot and Sour Powder a vegetarian? The raw material for making Guangyou hot and sour vermicelli comes from the green Guangyou sweet potato base, which is made of high-quality sweet potato and refined by alum-free sweet potato vermicelli processing technology. The vermicelli is crystal clear, smooth and delicious, soft and energetic, and has the effects of relaxing bowels, removing grease, slimming and beautifying skin. According to relevant data, Guangyou Chongqing Hot and Sour Powder is vegan.