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I would recommend cutting out one or the other and seeing what happens.
It's possible something in the Whey is aggravating you completely aside from the extra protein. A lot of people are sensitive to Whey in general. For example, I've tested it four times now and every time I take whey protein I break out in acne within 1 day. This is with high quality new zealand whey isolate with no artificial sweeteners.
I would try taking only BCAA's and seeing if you have the same reaction.
Too much protein compared to carbs can mimic/exacerbate hypoglycemia and cause headaches that way.
BCAAs can affect the levels of other animos in the brain, but I don't know how that translates.
If your other protein sources are high in arginine and low in lysine that can cause headaches (the dairy is high in lysine). Mine respond to lysine.
They increase the need for vits B2 & B6 for digestion. Whenever I get a headache, vit B2 depletion is involved.Has anyone else experienced HA, particularly at the back of the head from excessive protein or BCAA supplements?
I had 2 protein shakes today, plus 2 BCAA supplements, and my headache has gotten a lot worse. I think there may be a connection here..