Illegal cuz it was found to contain traces of Tadalafil i.e. Cialis.
https://www.hsa.gov.sg/docs/default-...70520final.pdf
That said, it was very effective for me when I took it about 5+ years back. Had a regular minah ML who brought it in from JB and asked me to eat it at the start of our session so that she can have fun hahaha.