★★★★★
I have been following an Italian neurologist for several years and one of his findings in his practice is that he has been able to help some of his patients with cluster headaches by treating them with high oral dose Vitamin B-1 / thiamine hcl. There are not a lot of effective natural treatments for cluster headaches so any help is a very good thing!
Here is a link to a paper that this doctor has done on the subject about one of his patients who had excellent results within 10 days in this case report!
https://www.hindawi.com/journals/crinm/2018/3901619/
Art