I had never heard of that one, seems most of the studies that showed promise were done with female subjects, here's what an AI model has to say about it....

Pumpkin seed oil has moderate-to-good evidence as a natural option for overactive bladder, especially in postmenopausal women and men with mild BPH-related OAB. It’s not as fast or strong as anticholinergic drugs or beta-3 agonists (mirabegron), but many people get noticeable improvement within 6–12 weeks, and it’s extremely safe for long-term use.If you’re considering it, look for cold-pressed pumpkin seed oil or a standardized Cucurbita pepo extract and give it at least 8–12 weeks at 1–2 g/day to judge effectiveness.