Zstack Best sellers, deals, coupon code & our review

About Zstack

Z-Stack Canada (zstack.ca) is the Canadian storefront for Z-Stack, a supplement sold by Zelenko Labs. The site is built around one product and pays tribute to Dr. Zelenko, whose name the brand carries. Its policies list a customer service team for Canada and a headquarters mailing address in Boca Raton, Florida.

What's for sale

The catalog has a single item: Z-Stack, listed at C$49 with two variants. The product page calls it the brand's original, best-selling, all-in-one supplement and says more than two million bottles have been sold worldwide. It's marketed for immune support. The product copy also makes broader health claims that we can't verify and won't repeat here; dietary supplements aren't a substitute for medical care, so check with your doctor or pharmacist before taking it, particularly if you're pregnant, nursing, managing a health condition or taking prescription drugs.

The ingredient list and dosage weren't included in the information available to us, so read the label on the product page and compare it with what you already take. Many immune-focused supplements overlap with common multivitamins, and doubling up on certain minerals isn't a good idea.

How it compares

There's not much to compare inside this store, since it sells one product. The real comparison is against other immune-support supplements at Canadian pharmacies and health stores. At C$49 a bottle, Z-Stack sits at the premium end for a single-formula supplement. If the specific blend matters to you, the Canadian store's main advantage is that it ships domestically for free, avoiding cross-border shipping and duties.

Shipping and returns

According to their shipping policy, all orders ship free across Canada by Canada Post Expedited Parcel, with processing in 1 to 3 business days. If a package comes back as undeliverable because of an address problem, they say a refund won't be issued, so double-check your address.

The refund policy is strict. All sales are final, which the company attributes to health and safety standards for consumable products. The exceptions are damaged or incorrect items: contact customer service within 30 days of purchase with photos, and they'll decide on a refund or replacement. Customer service is reachable by email at support@zstack.ca or by phone at 1-800-935-3656, Monday to Friday, 9 a.m. to 5 p.m. Eastern.

The site also promotes a newsletter it describes as freedom-minded news, so expect promotional and opinion content if you subscribe.

What stands out

• One product only: Z-Stack at C$49.
• Free shipping across Canada by Canada Post Expedited Parcel.
• No-returns policy, with exceptions only for damaged or incorrect items.
• Phone and email support with posted weekday hours.

Our favorite Zstack products

• Z-Stack® — Dr Zelenko's Original and Best-Selling Supplement: The store's single item, an all-in-one supplement marketed for immune support, at C$49 with free shipping in Canada.