R. S. Siregar¹*, Y. Widiyastuti², M. S. Siregar³, M. Silalahi⁴
¹ Universitas Muhammadiyah Sumatera Utara,
² Center for Research and Development of Medicinal Plants and Traditional Medicines. Health Research and Development Agency, Ministry of Health of the Republic of Indonesia,
³ Universitas Muhammadiyah Sumatera Utara,
⁴ Universitas Kristen Indonesia,