Is there a minimum amount to buy BNB?

Could you please clarify for me if there's a minimum amount required to purchase BNB? I'm interested in adding it to my portfolio but I'm not sure if there's a specific threshold I need to meet. I've heard rumors that some exchanges might have minimums, but I'd like to get a definitive answer from you, as an expert in the field. Could you also explain how this might affect my overall investment strategy? For instance, would a minimum purchase amount limit my ability to diversify or could it potentially have an impact on my returns? Thank you in advance for your assistance.