Has anyone ever heard of cardarine causing heartburn? I'm on day 4 at 14mg/day (2 caps, OL UK Cardar1ne) and it seems like ever since I started I've been getting heartburn really easily. Doesn't seem to matter specifically what I've eaten. Anyone heard of anything like that, or got any speculation on why it's occurring? This is my first time using any GW-1516 product.