Why peptide brands look for a Klaviyo alternative
Klaviyo is a strong product. Many peptide brands start there because it connects to their store and the flows are easy to build. The trouble is the acceptable use policy. As of 23 September 2026, the Klaviyo acceptable use policy (marked "Updated: April 9, 2026") says:
"You may not use the Services to offer products or services related to: ... Prescription medications, pharmaceutical products or services, medical therapies, telehealth, and other related technologies, products, or services."
The same page adds: "In addition, we reserve the right to evaluate and restrict any use cases related to illegal or controlled substances in accordance with the policies and compliance standards of our downstream providers."
Notice that the word peptide does not appear. That is the hard part. You can sign up, connect your store and send for months before anyone at Klaviyo looks at your catalog. The question of whether your products count as pharmaceutical products gets answered at review time, by Klaviyo, not by you. If the answer is yes, the account closes and your flows stop with it.
A closure also costs more than the tool. Your welcome series, abandoned cart and win-back flows stop the same day. Revenue that arrived on its own now needs a campaign to replace it, and you lose the history that told you which emails worked. That is why the choice of platform deserves more care than a feature list.
So the real question is not whether Klaviyo is good software. It is whether you want your most valuable channel to depend on a judgment call you cannot see coming.
What to check before you switch
Before you move a list anywhere, run four tests. They take ten minutes and they save you from moving twice.
- Does the written policy allow you? Read the acceptable use policy yourself. A friendly sales call is not the policy. If the policy names your category, believe it.
- Who runs the sending servers? If the platform rents its sending from a larger provider, that provider has its own rules too. Ask who sits above the account.
- Can you bring your list and suppression file? You need to import contacts and the people who opted out, so nobody who unsubscribed gets mailed again.
- Does it connect to your store? Flows need orders, carts and consent to arrive on their own. Without that, you have a newsletter tool, not email marketing.
Amino Engine
Amino Engine is an email platform for peptide brands. Our own acceptable use policy (last updated 5 September 2026) says: "We built this platform for peptide and research compound brands, because the mainstream providers throw them off." It is also strict in the other direction: "Research compounds are not medicines, and you may not describe them as if they were." No human-use claims, no dosing, no health testimonials. That rule protects every brand on the platform.
Here is how it answers the four tests.
- Policy: peptide brands are the reason the platform exists, and the policy says so in writing.
- Sending: your mail leaves from your own domain, on servers and IP addresses Amino Engine runs. No outside email provider sits above your account. New senders are warmed up over 42 days.
- List and suppression: import from Klaviyo or Brevo by CSV. Unsubscribes and bounces carry over as unsubscribes and bounces.
- Store: a WooCommerce plugin connects your store today. Shopify is next.
On top of that you get flows, campaigns, a drag-and-drop email builder, segments, signup forms (popup, flyout, embedded and a hosted page, with double opt-in built in) and revenue reporting. Revenue is attributed to the last email click within five days. Opens never count. There is an API and an MCP server, so an AI agent can build flows and emails as drafts, and a person switches them live. Klaviyo and Brevo publish MCP servers too (Klaviyo's, Brevo's), so that is not the difference. The policy and the sending are.
Every plan starts with a 7-day free trial with every feature included and no card to start. Plans are on the pricing page. For the full picture of how the channel works, read our guide to email marketing for peptide brands, or see a direct Amino Engine vs Klaviyo comparison.
Brevo
Brevo is the one mainstream platform that names peptides. As of 23 September 2026, section D.2 of the Brevo anti-spam policy, under "Content, products, or services not accepted regardless of legality", lists:
"Peptide-based products for injectable or oral human therapeutic, weight-loss, or performance use (e.g. GLP-1 analogues, growth hormone peptides), including those labeled "research use only", whether or not sold under prescription or legal in the recipient's jurisdiction."
The research use only label is named directly, and legality does not change the answer. For a research peptide brand, Brevo is not an option. We cover what that means for your list on our Brevo alternative page.
Omnisend
As of 23 September 2026, the Omnisend acceptable use policy (marked "Last Updated: April 30, 2026") lists in clause 3.2.1:
"Unauthorized, counterfeit, or illegally distributed pharmaceutical products, and prescription medications (including but not limited to drugs for research purposes);"
"Drugs for research purposes" is the closest wording to research use only you will find outside Brevo. Read it closely before you import a list.
Mailchimp
As of 23 September 2026, the Mailchimp acceptable use policy says:
"Some industries have higher-than-average abuse complaints, which can jeopardize deliverability. In order to maintain the reliability of our platform, we may not allow businesses that offer these types of services, products, or content: ... Pharmaceutical products"
The same policy lists "Nutritional, herbal, and vitamin supplements" under content subject to additional scrutiny. Peptides are not named. The words "may not allow" leave the decision with Mailchimp. See our Mailchimp alternative page for more.
ActiveCampaign and Sendlane
As of 23 September 2026, the ActiveCampaign acceptable use policy (marked "Effective: March 1, 2022") bars sending marketing content regarding "drugs, whether available only by prescription or over- the-counter, or any other product that claims to diagnose, cure, treat, or prevent a disease".
As of 23 September 2026, the Sendlane terms (marked "Updated on: 2/22/2024") say that "businesses offering the following types of services, products, or content cannot utilize our Services: (a) escort and dating services; (b) pharmaceutical products;". Neither policy names peptides. Both leave the category question to the platform.
Running your own server
Some brands give up on platforms and run their own mail server. It removes the policy question, but it hands you every other one. You own IP reputation, authentication, bounce handling, complaint loops, unsubscribe handling and warmup. You also lose the flow builder, the segments, the forms and the reporting unless you build those as well. For most brands the time is better spent on the store. A platform that runs its own servers for your category gives you the control without the upkeep.
The comparison table
Short quotes only. Follow the links for the full clause. All policies were read on 23 September 2026. No prices for other platforms and no star ratings, because those change and we cannot check them for you.
| Platform | What the policy says | Policy | Who runs the sending |
|---|---|---|---|
| Amino Engine | "We built this platform for peptide and research compound brands" | AUP | Amino Engine, from your own domain |
| Klaviyo | "Prescription medications, pharmaceutical products or services, medical therapies" | AUP | Klaviyo |
| Brevo | "Peptide-based products ... including those labeled "research use only"" | Anti-spam policy | Brevo |
| Omnisend | "including but not limited to drugs for research purposes" | AUP | Omnisend |
| Mailchimp | "we may not allow businesses that offer ... Pharmaceutical products" | AUP | Mailchimp |
| ActiveCampaign | "drugs, whether available only by prescription or over- the-counter" | AUP | ActiveCampaign |
| Sendlane | "(b) pharmaceutical products;" | Terms | Sendlane |
We keep a longer version of this table, with each clause in full, in our post on which email platforms allow peptide brands.
How to move in an afternoon
The move itself is short. Building trust with inboxes takes longer, and that part runs on its own.
- Export your contacts from Klaviyo as a CSV. Export your suppressed profiles too, so opt-outs come with you.
- Start your free trial and connect your WooCommerce store with the plugin.
- Import the CSV. Unsubscribes and bounces arrive as unsubscribes and bounces.
- Set up your sending domain. Warmup then runs for 42 days, with volume climbing gradually.
- Turn on your first flows from the ready-made library, starting with a welcome series and abandoned cart.
Our step by step guide, how to move from Klaviyo to Amino Engine, covers each step with more detail. If you would rather not do it yourself, the Done for you plan has our team build your flows and send your campaigns.
This page summarizes public policies as of 23 September 2026. This is general information, not legal advice.