Never used to get headaches from this, ever, been through maybe about 600-700g over the last like 5 years or so. Bought some new stuff from kaka labs (supposedly an American product but I found mostly from UK sellers) and yeah its given me a massive headache in the back of my head now for the last hour. Certi the phenibut, reminds me of an alcohol induced headache. It's on the Occipital bone in the back of my head, feels like more pressure in my head to be honest. Anyways, is this normal? Have I got a shitty product? I just don't remember this ever happening to me before with any last batches ive used. Haven't taken any in the last 18 months or so, maybe things have changed a lot, I dunno 😅