Contact Us — Complete Thyroid by Science Natural Supplements
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Get in Touch With Our Team

Questions about your order, refunds, ingredients, or anything else — our customer support team is ready to help you every step of the way. Real people, real answers.

Average response time: under 1 business day

Call Us

1-888-861-2035
Mon – Fri, 9 AM – 5 PM
Mountain Time
Fastest Response

Support Hours

Mon – Fri
9:00 AM – 5:00 PM MT
Closed weekends & U.S. holidays
Denver, Colorado
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How Can We Help You Today?

Fill in the form below and a member of our team will respond within one business day. For fastest service, call us directly.

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Thank you for reaching out. A member of our support team will reply to your email address within 1 business day (usually much sooner).

For urgent matters, call us directly at 1-888-861-2035.

Direct Contact Details

Phone 1-888-861-2035
Email [email protected]
Mailing Address 600 17th St, Suite 2800 South Tower
Denver, CO 80202
Support Hours Mon–Fri, 9AM–5PM Mountain Time

⚡ Typical Response Times

Phone call Immediate
Email Within 1 business day
Contact form Within 1 business day
Refund requests 1–2 business days

Helpful Resources

Track My Order ›
180-Day Refund Policy ›
Full Ingredient List ›
Product Benefits ›
About Science Natural Supplements ›
Our Location

Based in Denver, Colorado — Shipping Across All 50 States

Science Natural Supplements operates under Happier Healthier Supplements, headquartered in Denver, CO. All Complete Thyroid orders are fulfilled from our U.S.-based GMP-certified facility and ship within 1–2 business days.

For refund requests, subscription cancellations, or legal correspondence, please use the contact details below or send written correspondence to our mailing address.

MAILING ADDRESS Happier Healthier Supplements
600 17th Street, Suite 2800 South Tower
Denver, CO 80202, United States
CUSTOMER SERVICE 1-888-861-2035
EMAIL [email protected]
SUPPORT HOURS Monday – Friday, 9:00 AM – 5:00 PM Mountain Time
Closed weekends and U.S. federal holidays
Denver, CO 80202 Happier Healthier Supplements
Before You Write

Frequently Asked Contact Questions

Quick answers to the most common support questions — you may not even need to send a message.

How do I check the status of my Complete Thyroid order? +
Your tracking number is included in the shipping confirmation email sent after your order leaves our facility. You can use this number to track your package directly on the USPS or UPS website. Alternatively, visit our Order Tracking page or email us with your order number and we'll check the status for you. U.S. orders typically ship within 1–2 business days and arrive in 3–5 business days.
How do I request a refund under the 180-day guarantee? +
Contact us by phone at 1-888-861-2035 or email [email protected] with your order number and request. You do not need to return the bottles — even empty ones qualify. We recommend calling for the fastest processing. Full details are on our Refund Policy page. Refunds are typically processed within 1–2 business days of verification and appear in your account within 5–10 business days.
My package says delivered but I haven't received it — what do I do? +
First, check with neighbors, building management, or any secondary access points (garage, back door, etc.). Carriers sometimes scan packages as delivered early. If 24 hours have passed and the package still hasn't appeared, contact the carrier directly with your tracking number to open an investigation. Then reach out to us — we'll work with you to resolve the issue, whether that's a replacement shipment or a refund.
Can I cancel or change my order after it's been placed? +
Orders are processed quickly, often within hours of being placed. If you need to cancel or modify your order, contact us immediately by phone at 1-888-861-2035 — this gives you the best chance of catching it before it ships. If the order has already shipped, it cannot be cancelled but qualifies for a return and refund under the 180-day guarantee once received.
Is Complete Thyroid safe to take with my thyroid medication? +
Complete Thyroid contains selenium, iodine, zinc, and other trace minerals that may interact with prescription thyroid medications such as levothyroxine (Synthroid) or Armour Thyroid. We strongly recommend consulting your prescribing physician or pharmacist before combining any dietary supplement with thyroid medication. Our team can answer general ingredient questions but cannot provide personalized medical advice.
How do I cancel my subscription or auto-ship? +
To cancel a subscription, contact our support team at least 48 hours before your next billing date. You can call us at 1-888-861-2035 or email [email protected] with your order number and a cancellation request. We'll send you a written confirmation within 1 business day. Keep this confirmation for your records.
Where can I find my order number? +
Your order number appears in two places: the order confirmation email sent immediately after purchase, and the shipping notification email sent when your order leaves our facility. It is typically a string of 8–10 digits. If you cannot locate it, contact us with the email address used to place the order and we can look it up for you.
Do you ship internationally? +
Complete Thyroid is primarily available for U.S. domestic shipping across all 50 states. International shipping may be available depending on your location — contact us before placing an international order to confirm availability, estimated shipping time, and any applicable customs information. Note that the 180-day guarantee covers the product cost, but international shipping fees are generally non-refundable.

Limited Time Special Pricing — Act Now!

This Special Discount and Free Shipping & Handling Are Only Available for a Limited Time

Complete Thyroid special pricing packages 1 bottle 3 bottles 6 bottles
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