Pembuatan Ferro Proteinat Menggunakan Pasir Besi Dan Protein Limbah Kecap Serta Uji Permeasi In Vitro Dan Peningkatan Berat Badan Tkus = Synthesis of Ferrous Proteinate With Iron Sand And Soy Sauce Waste Protein, as well as In Vitro Permeation test And Weight Gain Test On Rats