Creatine is an amino acid supplement. [FONT=wf_segoe-ui_normal, Segoe UI, Segoe WP, Tahoma, Arial, sans-serif]Supplemental creatine is nothing more then the amino acids glycine, arginine, and methionine synthesized together. It is not a hormone and does not require a PCT (post cycle therapy). [/FONT]
[FONT=wf_segoe-ui_normal, Segoe UI, Segoe WP, Tahoma, Arial, sans-serif]You are most likely either:
1. Using a flavoured creatine product that has stimulants or artificial flavours/sweeteners added that is causing your headache
2. Not drinking enough water and the headache is due to dehydration.
If you are using an unflavoured creatine powder, try increasing your water intake. If you are using a flavoured creatine product, try switching to a bulk creatine monohydrate powder or a unflavoured capsulated creatine supplement like ancient strength from n2bm.com [/FONT]