Thank you for reaching out. It’s hard to say whether your headache is being caused by the product or by the fact that you’re fasting and exercising – which leads to low blood sugar. Low blood sugar is a sure trigger for headaches.
You could certainly try to use the Recover & Build which may help support your muscle tissue. Also, be sure your total daily protein intake is between .6 to 1 gram per pound of your body weight to support your muscle. Active people need more protein than sedentary individuals. Training with resistance/weights at least 3 times a week will help too.