Can this syrup be used to treat high prolactin levels in the body?

I want to be upfront with you here - this particular syrup is actually formulated as an appetite stimulant and nutritional support, not as a treatment for high prolactin. Managing elevated prolactin usually needs a proper blood test to find the underlying cause, followed by specific medication a doctor would prescribe based on that. I'd really encourage you to see a doctor or endocrinologist so you get the right treatment rather than relying on this one for that purpose.