Customer support
Contact Synthex Labs
Questions about eligibility, batch documentation, an order, shipping, or a return are handled directly by our support team.
Email support
Monday–Friday
9:00 AM–6:00 PM ET
We normally respond within one business day.
Business address
Synthex Labs LLC
945 Market St
San Francisco, CA 94103
United States
This is the official business correspondence address. Obtain an RMA before sending a return; the authorized return location may be different.
Order support
Include your order number and the email used at checkout. For damage claims, include clear photos of the shipping box, bottle, and seal.
Do not email card numbers, CVV codes, passwords, government identification, or other unnecessary sensitive information.
Before contacting us
Common questions are answered in the FAQs. Shipping timelines, claims, RMAs, and refunds are covered in the Shipping & Return Policy.
Product-use questions: Synthex Labs cannot provide medical advice, personal-use instructions, dosing guidance, or recommendations for human or animal use.