Do Natural Herbs Cause Weight Gain?

Weight gain through taking of chinese and Indian herbs? I drink a Tonic a day since 8 weeks and i gained 3 Kilos although I havent changed my mostly raw vegan diet. I practice a strong ashtanga yoga pracitce each day and noticed an increase of muscels but also fat on my body. I aks myself, what is going on? Happy to hear your answers. Thank you very much. Regards, Ginger , Munich, Germany