Doing research on the ground while I was waiting for my alterations to my pants at the local shopping centre.
You can do it yourself. Go walk into a pharmacy that doesn't stock it. Ask them hey do you stock wattle formula. They say no. Then ask hey are you able to order it in for me. They will say yeah sure we can. They go check on API. They come back and say yeah we can get it for you. Then say oh cool, is there lots of stock? They will say yes. Then ask them how many exactly. They will come back with a figure of XYZ. Ask them how much and say ok youll think about it. (Let's face it no one actually wants to buy wha IF and you certainly don't want to end up having to buy it)
Then a week later go to another pharmacy and do the same thing. Ask them how much stock API has. You will gauage how the sales from API are going.
I don't need to do this I just ask my friend direct. I stopped asking because he'd always tell me the same answer.
PS clearly not insider trading. API stock levels are well know and readily available to those with access.