Customer Service Hours

Phenastin provides Customer Service during the following hours.

Call us 800-495-8689 (please note that phone support request may experience a delay of up to 48 hours! For rapid and immediate service we suggest you use the contact form as we usually respond within 30 minutes during business hours.)

Monday – Friday from 9:00 am – 6:00 pm pacific standard time.

We are closed on the weekends.

Hayward, CA 94545

For fastest service, use our contact form for 24 hour service.  We normally respond to emails within 30 minutes during normal business hours.

If you have questions about tracking and shipping, please read our FAQ about shipping before requesting additional information.

Complete Customer Service Form

Please complete the form below to contact Customer Service. Please note that we strive to respond to all request as quickly as possible within our business hours. There is some support provided on Saturday and Sunday in limited capacity and not for billing issues.

Please select an option that best subscribes your request. Must select order issue if you are requesting information about an existing order.