1. How to contact with us?You can choose your interested products and send inquiry to us.Call us without any hesitation.2. How to confirm the products quality before placing orders?We will offer you our products specification standard to you, and we test every batch of our product by HPLC.UV,GC AND TLC AND etc. We also cooperate with independent third party lab such as SGS, PONY etc.3. How to make order & payment?Proforma invoice will send to you, or you can order via Alibaba Trade assurance.We can accept payment by TT, WESTERN UNION, Escrow, Paypal, L/C4. How to ship and delivery?Transit could be DHL, UPS, TNT, FEDEX, EMS. For mass orders, it will be ship by air or sea.5.Our reture service policyWe offer an unconditional, full money back guarantee, if you are not 100% satisfied with our products, return all goods back to us within 60 days and we will fully refund your money.