I read some positive reviews/testimonies on this herbal medicine in this website. I also noted from this article "Stressed? Get Some Happy Pills" that Xiao Yao Wan "is an extremely safe and mild formula, but highly effective at the same time" and it can be used for stress, mild anxiety, mild fatigue and so on.
After googling further about it, I learnt that a Chinese medicine hall in Singapore called Min Sheng He sells Wellring Xiao Yao Wan. I also learnt they have a retail store near the central part of Singapore.