Back-in-stock email for supplement brands

A back-in-stock email built for supplement and wellness brands whose hero SKU sold through before the next batch landed. Restock the run-out product, print the batch number, push subscribe-and-save, and keep every claim DSHEA-safe in ESP-safe HTML that drops into Klaviyo or Mailchimp.

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What makes this back-in-stock work for supplements / wellness

A supplement back-in-stock is not a "we restocked, here is 20 percent off" blast. The hero SKU sold out because demand outran the production run, and the people who clicked Notify me on the PDP are your highest-intent shoppers and your best subscription candidates. Treat the email accordingly.

Trigger and timing. Your Klaviyo Back in Stock flow (or the PDP waitlist form) should fire the moment inventory crosses a threshold, say 1,000 bottles on hand. Send the first email within 30 minutes of the restock going live. Supplement restocks move in days, not weeks: a batch of 12,000 bottles that cleared in nine days the first time will not sit. Send a second email at 48 hours to non-openers, and a third "almost gone" send at 72 to 96 hours once stock drops below 20 percent. With 8,600 people on the waitlist and 12,000 bottles to move, every hour of delay is lost subscription revenue.

Offer. The dominant play in supplements is subscribe-and-save, not a unit discount. The hero product just sold out at full price, so marking it down trains shoppers to wait. Convert instead. Lead with "Subscribe and save 15 percent" and pair it with free shipping on the restock order. In a category where reorder cycles run 30 to 45 days and subscribe-and-save attach rates clear 25 to 40 percent on back-in-stock sends, the subscription is worth ten times the one-time discount.

Copy angle. Lead with the form, not the hype. "Magnesium Glycinate 300mg. Each capsule delivers 300mg of elemental magnesium as glycinate, a form that supports restful sleep and muscle relaxation without the laxative effect of magnesium oxide." Name the certifications buyers screen for: third-party tested, manufactured in a GMP-certified facility, NSF Certified for Sport. Print the batch number (Lot MG-2406-118) so shoppers know the new run is fresh, not leftover stock. Put the dose, capsule count, and price as live text, not baked into an image.

Compliance. DSHEA draws the line, and supplement brands cross it by accident. "Supports restful sleep" is a structure-function claim and is fine. "Treats insomnia" is a disease claim and is not. The FDA disclaimer ("This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure, or prevent any disease") must appear on the email if you make any structure-function claim, and it belongs in the footer, set small but legible. Skip "treats," "cures," "heals," and "prevents" entirely. If you ship to the EU or UK, confirm the product is notified under the applicable food supplement registry and that any health claims are on the approved list. Link the full supplement facts panel.

CTA. One button. "Restock and subscribe." Do not stack secondary links under it. Back-in-stock emails that run a single CTA convert higher than versions with nav, cross-sell, and the blog piled underneath.

Subject line: "It's back. Magnesium Glycinate 300mg." Preheader: "Batch MG-2406-118 is live. The waitlist gets first access."

Why it renders in every inbox

Supplement emails lean clinical: clean type, a supplement facts panel, a long compliance footer. That density breaks in Gmail, Apple Mail, and Outlook if it is not built right. This build is table-based email that holds up where it matters.

The layout is nested HTML tables, not divs or flexbox. One 600 pixel outer wrapper stacks inner tables with role="presentation". This is the structure Outlook's Word engine understands, and it keeps your headline, facts row, and footer from collapsing into one block.

Every style is inline on the element it styles. Gmail strips the <style> block from the head, so any CSS that lives only in <head> disappears in the Gmail web client and the Gmail Android and iOS apps. Inline styles are the only guaranteed path.

The CTA is a bulletproof button. Outlook's Word renderer ignores border-radius and background color on an <a> tag, which turns a clean pill into a flat link. MJML's mj-button emits the VML fallback (a v:roundrect with a v:fill) so Outlook paints a solid filled rectangle with working corners. No image required, so the button still shows when images are blocked.

Product name, dose, and price are live text. If your supplement facts or pricing are baked into an image, they vanish in dark mode and read as blank boxes with images off. Live text survives both and stays legible to screen readers. The FDA disclaimer in the footer is live text too, small but selectable, not an image.

Dark mode is handled with the color-scheme meta in the head plus a prefers-color-scheme: dark block that swaps the background and text. The white card inverts cleanly instead of leaving a bright slab in a dark inbox, which is where most supplement shoppers read email at 11pm.

One mobile media query. At max-width 480px the hero headline drops to 28 pixels, the facts row tightens, and the CTA stretches full width on a phone. One breakpoint, no float hacks.

Web fonts load in the head but the stack always declares Georgia, Times New Roman, serif as a fallback. Gmail and Outlook ignore remote fonts, so the email falls back to a serif that still reads as clean and clinical rather than defaulting to Arial.

How to use it in Klaviyo or Mailchimp

The HTML exports paste-ready. Copy the full file.

In Klaviyo, open your Back in Stock flow email (or a one-off campaign), toggle the text block to Source, and paste. For a full custom template, go to Templates, Create Template, Import HTML, and upload the file. In Mailchimp, start a campaign, choose Code your own, then Paste in code, and drop the HTML in.

Swap three things first: the brand (Fernwell Naturals to your client's name), the hero image and its alt text, and the CTA link to the restocked product page. Then swap colors with a single find-and-replace pass on the hex codes. The accent is a deep botanical green (#2F5D3A) and the page background is warm off-white (#F5F2EC). Change both to your client's brand palette.

Wire the merge tags. In Klaviyo, the Back in Stock event carries the product for you: {{ event.extra.product_name }} for the SKU ("Magnesium Glycinate 300mg"), {{ event.extra.product_url }} for the PDP link, and {{ event.extra.variant_name }} for the size ("90 capsules" or "180 capsules"). Point the subscribe-and-save button at the subscription URL with {{ event.extra.subscribe_url }}, and surface the batch with a custom property {{ person|lookup:'Restock Lot' }}. Greet with {{ first_name|default:"there" }}. In Mailchimp, use *|FNAME|* for the first name and *|PRODUCT_URL|* for the PDP link, with *|LIST:COMPANY|* for the brand name in the footer and *|BATCH|* mapped to your lot field.

Keep the FDA disclaimer. If you strip the footer to save space, you lose the disclaimer and the unsubscribe link, and the email is no longer compliant. The disclaimer stays.

Then test. Send to Litmus or Email on Acid and check four clients: Gmail web, the Gmail iOS app, Apple Mail in both light and dark mode, and Outlook 365 desktop on Windows. Confirm the VML button paints as a solid filled rectangle in Outlook, the dose and price stay legible when the inbox flips to dark, and the CTA stretches full width on a phone. Run the dark mode check on Apple Mail specifically, since that is where most supplement shoppers read email.

Questions

Is this back-in-stock email free to use for my supplement clients? +

Yes. The HTML and MJML are free to copy and use. Paste them into Klaviyo or Mailchimp for any supplement or wellness client and keep the result. You do not owe us anything and there is no watermark.

Will it break in Outlook? +

No. The CTA uses a bulletproof VML button, so Outlook's Word engine paints a solid filled rectangle with rounded corners instead of flattening the link. The layout is nested tables, which is the structure Outlook supports. We test in Outlook 365 on Windows before shipping.

Can I change the green to my client's brand color? +

Yes. Find-and-replace the hex in the inline CSS. The accent (#2F5D3A) and the warm off-white background (#F5F2EC) are the only two colors you need to swap for most supplement brands. The dark mode block flips them automatically.

Do I need to know HTML to use this? +

No. The markup is paste-ready and the text you edit sits in clearly marked spots. If you want to restructure the layout, edit the MJML source and recompile, and you get the same ESP-safe HTML back out.

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