Sulbutiamine (brand name: Arcalion) is a synthetic derivative of thiamine (vitamin B1).

I recommend a natural wholesome alternative product for you to enhance the ability of the brain to concentrate, and to alleviate complications brought on by stress and insomnia.

Made from nutritional ingredients: Bee pollen, pearl powder, cassia and onion. It is specially formulated to nourish the nervous system. 

http://www.eexcel.com.my/pr_sv_conc_stres.shtml

It is your choice whether to take synthetic chemical supplement or natural wholesome health product.

Please pm if interested. Thank you