Yes According to the health inquiry of Cai Niu, silkworm excrement is still effective after a long time. Efficacy and function of silkworm excrement: silkworm excrement, also known as silkworm excrement, late silkworm excrement, raw silkworm excrement and silkworm excrement, has the effects of eliminating dampness, expelling wind, regulating stomach, resolving turbidity, promoting blood circulation and relieving pain. Silkworm excrement is mainly used to treat rheumatism, headache, skin itching, cold pain in waist and legs, abdominal pain and vomiting.