The butter was made with Shiva Shanti - 1oz. I followed the method described in this forum. After eating it, a mild headache occurred and stomach became nauseous. Neither lasted long but it seems every time it was consumed the same symptoms occur. The Shiva was not fresh, it had been frozen in vaccum sealed jars for almost a year (Shiva is not my favorite, it was kept for cooking).
What would cause these symptoms?