try "tung-uk-kei-ying-yuen", they have 2 types: gold or silver. i have been giving those pills to my bb since he was 2 months, it works cos it calms him down before he sleeps.
gold: ~hkd300
silver: ~hkd90
i don't find any difference, so i would choose silver, it is safe to have them, made in japan, also long history! :)