Your ads are working. Sales are coming in.

But repeat purchases are flat, and your email list barely gets touched.

This is one of the most common gaps we see in supplement brands right now. The brand has a solid paid ads partner (or is building one), but nobody owns retention, meaning email, SMS, and the customers who already bought once.

So the question keeps coming up. Should your ad agency also run email and SMS, or should that be a separate specialist?

Here is how to think it through, without guessing.

What Each Agency Actually Owns

A paid ads agency (like eBrandX) owns the top of the funnel. That means creative, targeting, budget, and turning cold traffic into a first order.

A retention agency owns everything after that first order. Welcome flows, abandoned cart, post-purchase upsells, subscription reminders, and win-back campaigns.

Those are genuinely different skill sets. Great ad buyers are not always great email strategists, and the reverse is true too.

If you are still deciding whether you even need outside help at the acquisition stage, our guide on when to hire your first marketing agency walks through the signs you are ready.

The Case for One Partner

Combining both under one roof can work well for newer or smaller brands. Here is why.

1. Fewer handoffs. One team already knows your offer, your compliance limits, and your customer.
2. Lower cost. Two retainers plus two account minimums adds up fast for a brand still under $30k a month in ad spend.
3. Faster testing loop. A winning ad angle can turn into an email subject line the same week, with no extra meeting needed.
4. One point of accountability. When something breaks, there is no back and forth about whose fault it was.

The Case for Two Partners

Splitting the work usually wins once a brand is scaling. Here is why.

1. Depth over breadth. A retention-only agency lives inside Klaviyo or a similar platform all day. That depth shows up in open rates and flow revenue.
2. Bandwidth. Once you are running real ad spend, your ad agency should be spending its hours on creative testing, not writing your Black Friday email calendar.
3. Specialized compliance. Supplement email and SMS have their own claim rules and opt-in requirements, separate from Meta and TikTok policy.
4. Cleaner reporting. You can actually see which channel is driving new customers versus repeat revenue, instead of one blended number.

Common mistake: hiring one agency to "do everything" (ads, email, SMS, sometimes even the website) mainly because it feels simpler.

That bundle is rarely where a brand gets the best result in any single channel. It is usually where a brand gets an average result in three channels at once.

Signs Your Current Setup Isn't Working

Before you change anything, check whether the problem is really the agency structure, or something else entirely.

Watch for these:

• Your email list has more than 5,000 contacts but no active flows running.
• Your ad agency sends a "newsletter update" once a month with no real strategy behind it.
• Nobody can tell you your repeat purchase rate off the top of their head.
• Your welcome flow was set up once, over a year ago, and never touched again.

Any one of these usually means retention has been neglected, whether you have one agency or two. If a few of these sound familiar and your agency relationship overall feels stuck, it may be worth reading our scaling checklist for outgrown agencies as well.

What Good Coordination Looks Like

If you do split acquisition and retention across two partners, a few habits keep it from turning messy.

Share one offer calendar. Both teams should know exactly when a promo launches, so an email does not undercut a live ad angle.

Sync creative assets. Winning ad hooks and images should flow straight into email and SMS, not get rebuilt from scratch.

Agree on who owns the customer data. Both sides need clean access to the same source of truth, usually your Shopify or platform data, not two separate spreadsheets.

One short monthly call between both teams, even 20 minutes, solves most of the coordination problems before they start.

A Simple Comparison

Factor	One Combined Agency	Two Specialist Agencies
Best for	Brands under roughly $30k/month ad spend	Brands scaling past $30k to $50k/month ad spend
Monthly cost	Usually lower, one retainer	Higher, two retainers
Depth per channel	Moderate	High
Coordination effort	Low, one team	Higher, needs a shared calendar and clear owner
Reporting clarity	Can get blended	Usually cleaner, channel by channel

These are general starting points, not fixed rules. Your actual break-even point depends on your margins, your average order value, and how complex your product line is.

5 Questions to Ask Before You Decide

1. What percent of my revenue currently comes from repeat customers versus first-time buyers?
2. Do I already have basic flows (welcome, abandoned cart, post-purchase) turned on at all?
3. How many hours a week is my current ad partner realistically spending on my account?
4. Would a dedicated retention specialist pay for itself through more repeat orders within 90 days?
5. If I split the two, who owns the shared calendar so campaigns do not clash?

If you are unsure how a partner should be priced either way, our breakdown of retainer versus performance-based agency pricing is a useful next read before you sign anything.

Quick Answers

Can I switch from one combined agency to two specialists later?

Yes. Most brands start with one partner and add a retention specialist once repeat revenue becomes a bigger piece of the business.

Will splitting the work slow down my creative testing?

It should not, as long as both teams share assets. A dedicated ad partner can usually test faster, not slower, once retention is off its plate.

What size brand should stop bundling everything into one agency?

Once you are spending more than roughly $30,000 to $50,000 a month on ads, a dedicated retention specialist usually earns back its cost quickly.

Where This Leaves You

Here is the honest, unbiased version. eBrandX is built as a paid acquisition specialist for supplement brands, running Meta, TikTok Shop, and Amazon.

We do not try to also be your email and SMS team. In our experience, that is exactly the kind of bundling that leads to average results everywhere.

What we do instead is make sure our creative and offer strategy lines up cleanly with whatever retention setup you already have, or help you figure out when it is time to bring one in.

If you want a second opinion on whether your current split between acquisition and retention is actually working, or you are ready to bring in a dedicated ad partner, book a free call with our team. We will tell you honestly if you need one partner or two.

Not sure if your ad account needs a specialist or a full retention rebuild?

Book Your Free Strategy Call

And if you are also weighing whether a UGC-only shop or a full-service agency fits your stage better, that decision runs on similar logic. Our guide on UGC agency versus full-service agency breaks that comparison down the same way. For more like this, join Supplements Scaling Insiders.