Terms of service

Effective Date: October 26, 2026
Last Updated: October 26, 2026

These Terms of Service ("Terms") govern your access to and use of https://zstacklife.com, https://careportal.zstacklife.com, and any related websites, services, guidebooks and communications operated by Zelenko Labs LLC ("Zelenko Labs," "we," "us" or "our").

By visiting our site, creating an account, making a purchase, completing a clinical intake, or opting into email or SMS communications, you agree to these Terms and our Privacy Policy. If you do not agree, do not use our website or services.

1. Eligibility and use

  • Age requirement. You must be at least 18 years old to purchase, subscribe or use our patient care portal.
  • Minors and supplements. Dietary supplements labeled for children are sold to adults, who are responsible for supervising their use by a child.
  • Prohibited conduct. You may not use our products or services for any unlawful, fraudulent or abusive purpose, and you may not resell, transfer or redistribute any kit, or any prescription medication, obtained through us.
  • Right to refuse. We may refuse service, cancel orders, restrict access or terminate accounts where we reasonably believe you have violated these Terms or applicable law.

2. What we sell

  • Dietary supplements and wellness products. Sold directly by us, with no prescription or consultation required.
  • Medical kits ("Kits"). Kits may include prescription medications, where prescribed. A licensed clinician reviews your clinical intake and determines whether, and which, prescription medications are appropriate for you. Any prescribed medication is dispensed by a licensed pharmacy and prescribed to one named individual.

Supplements: medical disclaimer

Our dietary supplements are not intended to diagnose, treat, cure or prevent any disease. Statements about them have not been evaluated by the Food and Drug Administration. Consult a licensed healthcare professional before using any supplement, particularly if you are pregnant, nursing, taking medication or have a medical condition.

Kits and prescription medications: medical disclaimer

Information on our website, in promotional materials and in any guidebook supplied with a kit is general education, not medical advice, and does not replace evaluation by a qualified healthcare professional. Kits are not intended for use in a medical emergency; call 911 or your local emergency number immediately if you believe you are experiencing one.

3. Telehealth and prescription services

  • We are not a medical provider. Zelenko Labs is an e-commerce and platform company. We do not practise medicine, employ physicians, provide medical consultations, issue prescriptions or dispense medication.
  • Independent telehealth and pharmacy. Telehealth consultations and prescribing are provided by independent telemedicine providers through clinicians licensed in the state where you are located. Our current Telehealth Providers are:
  • Beluga Health, P.A. — belugahealth.com; clinician licensing information at belugahealth.com/about
  • The Telehealth Provider and the licensed pharmacy handling your order are identified in the patient care portal before you consent to a consultation, and on your order confirmation. The provider-patient relationship is between you and the treating clinician, who exercises independent professional judgment.
  • Before your consultation. You will be asked to review and agree to the telehealth provider's own informed consent, privacy policy and Notice of Privacy Practices in the patient care portal.
  • Your responsibilities. You must provide accurate, complete information at clinical intake, including your medical history, current medications, allergies and your physical location. You must provide government-issued photo identification when asked.
  • A prescription is not guaranteed. Purchasing a kit does not guarantee that a prescription will be issued. The reviewing clinician may determine that treatment is not appropriate, in whole or in part. Section 5 explains what happens to your payment in that case.
  • Single-user restriction. Any prescription medication included in a Kit is prescribed to one named individual and is for that person only. Transferring or sharing it with anyone else is unsafe and unlawful. Kits are intended for use under the guidance of a healthcare provider when qualified medical care is not readily accessible. They are not intended for stockpiling.
  • United States only. Telehealth consultations and Kits are available only to customers located in the United States, in states where our provider operates.

4. Orders, pricing and subscriptions

  • Pricing and availability. Prices are subject to change without notice. We may limit quantities, refuse orders or restrict shipping based on fraud risk, regulatory requirements or inventory. Product packaging and sourcing may change without notice. Where a purchase includes a clinical consultation, the price shown at checkout covers both the consultation and, where prescribed, the product.
  • Subscriptions. Some supplement products are offered as recurring subscriptions. The price, billing frequency and next renewal date are shown before you subscribe and in your account at all times. By subscribing you authorize us to charge your payment method at that price and frequency until you cancel. You can pause or skip a renewal and update your shipping and payment details from the Subscriptions page of your account. Kits are not sold on a subscription basis and require a new clinical review for each order.
  • Introductory offers. From time to time we offer a reduced price on the first order of a supplement subscription. Introductory offers do not apply to Kits. The introductory price applies to the first order only. Unless you cancel, your subscription then renews at the regular subscription price and frequency shown with the offer and at checkout, plus any shipping and handling stated there. You consent to the recurring charges at checkout before your order is placed. We send you a reminder, with the renewal amount, date and how to cancel, before the first charge at the regular price.
  • Cancelling a subscription. You can cancel at any time, with immediate effect, from the Subscriptions page of your account, or by contacting Customer Support. A cancellation counts from the moment you submit it in your account or your message reaches us, not from when it is processed. If your cancellation is submitted before the renewal charge is processed, no further charge is made. If a renewal has already been charged when your cancellation is received, that order will ship and is subject to the supplement return terms in Section 5; your subscription ends after that order. We send a reminder email before each renewal.
  • Price changes. If we change the price of your subscription, we will notify you in advance, and you may cancel before the new price takes effect.

5. Refunds, returns and chargebacks

Kits

The price of a Kit is a single bundled price that includes the clinician's review of your intake and related services. The clinical review is performed whether or not a prescription is issued.

  • Declined prescription. If the clinician determines that no prescription is appropriate, no prescription medication will ship. Your order is automatically reviewed for a partial refund. The refund amount is based on applicable state requirements and the circumstances of the order, and may vary because the bundled purchase price includes clinical review and other services performed whether or not a prescription is issued. Refunds are issued to the original payment method.
  • Partial prescription. If the clinician prescribes some but not all items in the kit, the kit ships with the prescribed items. You may contact Customer Support to request a refund for items not prescribed; such requests are reviewed individually.
  • Refund method. Refunds are issued to your original payment method. Your card issuer may take additional time to post the credit.

Returns of medication

Once a prescription has been dispensed by the pharmacy, the medication cannot be returned, exchanged or refunded. This is a pharmacy law requirement and applies whether or not the package has been opened.

Lost, damaged or incorrectly filled Kit orders

The no-return rule does not apply where something goes wrong before your medication reaches you in good condition. If your Kit order does not arrive, arrives damaged, or does not match what the clinician prescribed, contact Customer Support within 30 days of the expected delivery date. We will work with the Pharmacy to have the affected items re-dispensed and reshipped at no charge, or, where a replacement is not possible, refund the affected items.

Supplements

For health and safety reasons, supplement sales are final. If a supplement order arrives damaged, is missing items, contains the wrong items, or does not arrive, contact Customer Support within 30 days and we will replace or refund the affected items.

Customers in the EU and UK have a statutory 14-day right of withdrawal for unopened products; see our Refund Policy.

Shipping address errors

You are responsible for entering a correct shipping address. Orders shipped to an address you entered incorrectly are not refundable, and we are not responsible for packages lost or delayed as a result.

Chargebacks

If you have a problem with an order, contact us first. Payment disputes raised without contacting us may result in suspension of your account.

6. International orders

Availability of our dietary supplements and wellness products is determined by your shipping destination. Where a product may be subject to regulatory restrictions in a destination country, it is not available for purchase from that country, and we review and update these restrictions regularly. Kits and any prescription medications are not shipped internationally and are available only to customers located in the United States.

If you order from outside the United States, you are responsible for complying with the customs, import and product regulations of your own country. Customs duties, taxes and clearance delays are your responsibility, and we are not responsible for shipments seized, delayed or returned by customs.

7. Messaging, accounts and intellectual property

SMS and email

By providing your phone number and opting in, you consent to receive recurring automated marketing, promotional and transactional text messages from Zelenko Labs LLC, including messages sent using an automatic telephone dialing system. Consent is not a condition of purchase. Message frequency varies. Message and data rates may apply. To opt out, text STOP to 32402. For help, text HELP to 32402. Carriers are not liable for delayed or undelivered messages.

Messages about your clinical care come from your telehealth provider through the patient care portal, not from our marketing systems.

Who receives your mobile number

Your mobile number is shared only with the parties who need it to deliver a message or a service you have asked for:

  • Our messaging provider, which receives your number solely to deliver messages on our behalf.
  • Our Telehealth Provider, so a clinician can reach you about your care.
  • Our Pharmacy, where a prescription is dispensed, so your order can be filled and delivered.

These parties may use your number only to perform that work. Mobile information is not shared with third parties or affiliates for marketing or promotional purposes. Text messaging originator opt-in data and consent are not shared with any third party.

Account verification and one-time passcodes

We use a toll-free number, operated for us by our messaging provider, to send verification messages and one-time passcodes.

  • When we send them. Only when a code is needed: when you create or sign in to an account, when you verify your identity during clinical intake, or when you ask us to resend a code. We do not send marketing messages from this number.
  • What we collect and why. We collect the mobile number you give us, and a record of your request, solely to deliver and verify the code and to confirm that the number belongs to you. We do not use a number collected for verification to send you marketing.
  • Consent. By entering your mobile number and requesting a code, you consent to receive that message. If you do not want to receive verification messages, do not request a code; you can contact Customer Support for another way to verify.
  • Frequency and rates. Message frequency depends on how often you request a code. Message and data rates may apply.
  • HELP and STOP. Reply HELP for assistance or STOP to stop messages from this number. Stopping verification messages may prevent you from signing in or completing clinical intake, since a code is required for both.
  • Sharing. Mobile information is not shared with third parties or affiliates for marketing or promotional purposes. Text messaging originator opt-in data and consent are not shared with any third party. Our messaging provider receives your number only to deliver messages on our behalf.

Accounts and security

Keep your login credentials confidential. You are responsible for activity under your account and should contact us immediately if you believe it has been compromised. Your patient care portal account is personal to you and must not be shared.

Intellectual property

All content, software, logos, trademarks and kit guidebooks are owned by Zelenko Labs LLC or its licensors and are protected by intellectual property law. Guidebooks and materials supplied with your kit are for your personal, non-commercial use only.

Third-party services

We use third-party providers to operate our business, including e-commerce, payment processing, shipping, messaging, telehealth and pharmacy services. Their services are governed by their own terms. Where our site links to a third-party website, we are not responsible for its content or practices.

8. Disclaimers, liability and governing law

  • Disclaimer of warranties. Our websites, products, guidebooks and services are provided "as is" and "as available", without warranties of any kind, express or implied. Nothing in these Terms limits any warranty or right that cannot be excluded under applicable law.
  • Clinical services. We are not responsible for the clinical decisions, medical advice, diagnosis, treatment or prescribing of the independent clinicians who provide telehealth services, or for the dispensing practices of the pharmacy. Nothing in these Terms limits any right you have against a treating clinician or a dispensing pharmacy.
  • Limitation of liability. To the maximum extent permitted by law, our total liability arising out of these Terms or your use of our products will not exceed the amount you paid us in the past twelve months. We are not liable for indirect, incidental, special, consequential or punitive damages. Nothing in this section excludes liability that cannot lawfully be excluded.
  • Indemnification. You agree to indemnify and hold harmless Zelenko Labs LLC, its affiliates, officers, employees and agents from claims, losses and expenses arising out of your misuse of our products or services, your breach of these Terms, your violation of any law, or your transfer of prescription medication to another person.
  • Governing law. These Terms are governed by the laws of the State of Florida, without regard to conflict of laws principles.

9. Changes, severability and contact

We may update these Terms from time to time by posting the revised version here with a new date. Continued use of our sites or services after a change means you accept the revised Terms. If any provision is held invalid or unenforceable, the remaining provisions remain in full force.

Contact us

Zelenko Labs LLC
9045 La Fontana Blvd, Suite 105
Boca Raton, FL 33434
Email: support@zstacklife.com
Phone: 1-800-ZELENKO (1-800-935-3656)

Clinical questions go to your provider through the patient care portal. Privacy requests go to privacy@zstacklife.com.