What exactly are you trying to use it for? Because I don't think there's much research on chaste berries specifically, searching for it on LibGen got me nothing. There is, however, plenty of research on preventing acne and PMS. Advice on both kind of overlaps, but basically, for acne:
>cut out or replace dairy products, cocoa powder, chocolate, sunflower seeds, anything you've noticed causes a flare for you
>improve your oral hygiene and maybe drink green tea for it (shown to be anti-bacterial and as good as mouthwash at killing bad bacteria in your mouth, but also good for your gut flora)
And for PMS, cramps, nausea and diarrhea on or before your period more specifically:
>lower saturated fat intake (animal products are highest in it)
>try dried ginger spice (shown to be as effective at stopping nausea and pain as Ibuprofen in some studies, you can buy capsules, but you could also buy the spice for cheap and put it in a drink)
>exercise more and make sure to do cardio
I'm sorry I can't be specific to what you're asking exactly. I don't think anyone could answer your question in a way that would be meaningful, personal experience is just anecdotal and it doesn't mean it would go the same way for you. The WebMD article (yeah, I know) says it can react with certain medications. The side effects include dizziness, upset stomach, acne, and another is strong menstrual bleeding, which seems the opposite of what you want to achieve, if I got your reasoning right.
In my opinion, there's no use in bothering with buying it as a supplement. Supplements are badly regulated in the US and you don't know what you'll get exactly, some of them contain heavy metals. I'm almost alone in believing this, but I don't think you should fuck with your hormones, either. I've had all the side effects listed above because of some medications and it's honestly terrifying and nothing you wanna be dealing with, I bled through pads in less than an hour and had uterine pieces the size of half a golf ball come out and had some of the worst cramps I've ever had. It's very scary.