Everyone starts by asking for reliable suppliers. That’s not your first problem.
In peptides, your real bottlenecks are payments, compliance language, and fulfillment risk, not sourcing. There are plenty of labs that will sell to you. Very few setups survive card scrutiny, chargebacks, and international shipping issues.
Before you think worldwide shipping, make sure you understand how you’re structuring RUO positioning, how you’re handling payments, and what happens when your first processor freezes funds. The supplier is step three, not step one.