Almost every DTC founder I audit has the same acquisition stack: Meta, Google, maybe TikTok. They optimise creative, test audiences, tweak bidding strategies, and watch ROAS slowly decline as competition and CPMs rise. When I ask how many brand partnerships they have run in the last twelve months, the answer is almost always zero.
Brand partnerships and co-marketing are the acquisition channel with the lowest CAC most DTC founders have never activated. The mechanics are simple: when a brand whose audience already trusts them recommends your product, the trust transfers. A customer who finds you through a brand they love converts at 5-12%, not the 1-2% cold traffic conversion rate you are fighting for on paid social. That difference in conversion efficiency is what makes the CAC so much lower.
This post covers the full playbook: how to identify the right partner, the four types of co-marketing campaign that work for DTC brands, how to pitch them, how to structure the deal, and how to track whether it is actually working. It is based on what we have run and measured across drinks, beauty, and wellness brands at revenue stages from £10K to £150K a month.
Why brand partnerships outperform cold paid media on CAC
Cold paid media puts your ad in front of someone who has never heard of you and asks them to buy something. The friction is high. You are competing with every other brand targeting the same audience, bidding against attention that is already stretched. Even well-optimised campaigns on Meta in beauty and wellness are seeing CPAs of £25-50 for a first-time buyer in 2026, depending on AOV and category.
A co-marketing email from a brand a customer already buys from is fundamentally different. They open it because they trust the sender. When the sender says "this brand is worth trying," that is a recommendation with context and credibility behind it. The prospect already has the app, the card saved, and the habit of buying from that category. Your job is to convert someone who is already warm, not to educate a cold stranger.
The third reason partnerships compound in a way paid media does not: every partnership you run adds net new customers to your email list. Those customers then receive your welcome series, your flows, and your campaigns. If your 90-day repeat purchase rate is 25%, every 100 partner- referred customers generates 25 repeat buyers with zero additional acquisition cost. Paid media does not compound. Brand partnerships do.
The practical result is that a brand running two or three well-executed partnerships per quarter often acquires customers at a blended CAC 40-60% lower than their Meta baseline, with higher LTV on those customers. The only reason this channel stays underused is that it requires human relationship-building rather than a budget and an ad account.
The 5 criteria for a good partner
The quality of a brand partnership is almost entirely determined by how well you choose the partner before any campaign mechanics are agreed. A perfect campaign structure with a wrong partner will underperform a mediocre structure with the right one every time. These are the five criteria that determine partner quality.
Complementary audience, not a competing product
The ideal partner serves an identical customer with a completely different product. A functional hydration brand and a magnesium supplement brand share the same health-conscious, active buyer in their thirties. There is zero product overlap, so there is no cannibalisation risk, but the audience fit is exact. Contrast this with partnering with another drinks brand: overlapping product category means the recommendation feels like a trade-off rather than an addition.
The test: would your best customer plausibly buy from this partner within the same month? If yes, the audience fit is right. If the answer requires mental gymnastics about lifestyle categories, look elsewhere.
Similar scale within a reasonable range
The most efficient partnerships happen between brands within roughly 30-40% of each other in email list size and social following. If one brand has 50,000 email subscribers and the other has 5,000, the economics break down quickly. The smaller brand gets a massive acquisition event; the larger brand gets almost nothing in return. That imbalance either means the smaller brand needs to compensate financially, or the partnership falls apart before it starts.
For your first partnerships, target brands with email lists between 60% and 140% of yours. The value exchange is balanced, the negotiation is simpler, and both brands are motivated to make the campaign work because both have something to gain.
Shared values and visual identity
When a brand recommends you to their audience, they are putting their credibility behind your product. If your visual identity, price positioning, and brand values do not align, the recommendation feels incongruous and the trust transfer does not happen. A premium, minimal skincare brand recommending a budget health supplement in plasticky packaging creates cognitive dissonance for the reader.
Before reaching out to any potential partner, buy their product, read their emails, and spend ten minutes on their Instagram. Ask honestly: if I were a customer of this brand, would a recommendation from them feel credible? If it does not feel credible to you as an outsider, it will not convert for their audience.
Genuine engagement, not inflated subscriber counts
A 20,000-subscriber email list with a 45% open rate is far more valuable for a partnership than a 50,000-subscriber list with a 12% open rate. The engaged smaller list has 9,000 people reading every email. The inflated larger list has 6,000. Subscriber counts in isolation are a vanity metric. What you care about is how many real people will actually read the email recommending you.
Ask any potential partner for their average email open rate and click rate before agreeing to terms. Any serious brand operator will share these numbers if the partnership is genuine. If they refuse or cannot access them, that tells you everything about how seriously they manage their email programme.
Founder-led or operator-run, not investor-driven
Partnerships with founder-led brands move faster, make decisions more quickly, and tend to put more genuine effort into the campaign execution because the founder has personal skin in the result. VC-backed brands with large marketing teams and approval processes can take six to eight weeks to approve a simple email swap and often produce generic campaign copy that their audience does not engage with.
The best partnerships happen between founders who can get on a 30-minute call, agree to try something, and have an email live within two weeks. That speed and flexibility is only possible when the decision-maker is also the brand builder. Prioritise founder-run partners, even if it means slightly smaller scale.
The 4 types of co-marketing campaign that work for DTC
Not all brand partnerships are the same. These are the four formats that DTC brands in drinks, beauty, and wellness are running, ranked from lowest complexity to highest. Start with email swaps. Add other formats once you have a proven partner relationship.
Email list swap
Both brands send a dedicated email to their own subscriber list recommending the other brand, with an exclusive offer - typically 15-20% off the first order. No email addresses are shared. Each brand writes their own email in their own voice. Each uses a unique UTM link and a dedicated landing page. Typical conversion rate from the partner's list to a first-time purchase is 3-8%. A list swap between two brands with 15,000 engaged subscribers each, both with 40% open rates, will put your recommendation in front of roughly 6,000 qualified prospects on each side. At a 5% conversion rate, both brands acquire 300 net new customers per campaign. At a £25 CAC equivalent on Meta, that is £7,500 in customer acquisition value from an email that cost roughly two hours to write.
Joint bundle or gift set
Both brands contribute product to a co-branded bundle or gift set sold through one or both storefronts. A wellness drinks brand and a functional supplement brand create a 'Morning Ritual Kit' sold at a combined price that represents better value than buying both separately. The bundle is featured in each brand's email campaigns, social content, and product catalogue. Joint bundles work best for brands with high gift purchase rates - drinks, beauty, and wellness all qualify. The AOV on bundle purchases is typically 25-40% higher than a single-brand sale. The mechanism also creates a product photography and content asset both brands can use independently. Execution requires agreeing on product quantities, pricing, and which Shopify store hosts the checkout, but the operational lift is lower than most founders expect.
Co-created content
Both brands collaborate on content distributed across each other's channels. This includes co-hosted Instagram Lives or Reels, newsletter features, podcast appearances, or joint editorial (a guide, a recipe, a morning routine) that is useful to both audiences. The content itself is the mechanism for reaching each other's audiences, rather than a direct recommendation or offer. Co-created content works best when both brands have genuine expertise that is relevant to the other's audience - a hydration brand and a fitness recovery supplement brand co-creating a 'pre and post workout nutrition guide' is credible and valuable for both audiences. Cost is primarily production time rather than cash. CAC is typically £6-15 per customer attributed to co-created content, which is substantially cheaper than paid media, though attribution is less precise than an email swap with unique UTMs.
Co-branded product launch
A limited-edition SKU that combines both brands' IP, sold as a true co-branded product with both logos and shared brand equity. A collagen supplement brand and a premium skincare brand might co-create a 'skin health bundle' with custom packaging featuring both identities. A wellness tea brand and a mindfulness app might launch a physical and digital bundle that requires genuine product and tech integration. Co-branded products are the highest-equity partnership format and the most complex to execute. They require alignment on quality, pricing, production timeline, and how inventory and revenue are split. They are typically only viable once you have an established relationship with the partner brand and both have the operational capacity to deliver on a defined timeline. The upside is significant: co-branded products generate press coverage, social amplification, and brand equity neither brand could achieve alone.
How to pitch a brand partnership
Most co-marketing pitches fail because they are too vague, too long, or sent to the wrong person. A marketing coordinator does not have the authority or motivation to greenlight a brand partnership. A founder does. Find them on LinkedIn or Instagram, reach out directly, and keep the pitch to three sentences.
The three-sentence pitch structure: why you specifically chose them, what you are proposing to do, and what is in it for them. Every partnership pitch should answer those three things within the first paragraph. If you cannot do that, you have not thought through the partnership well enough yet.
Example pitch message
Hi [Name], I run [Brand] - we make [product] for the same customer you are building for. I have been following your brand for a while and genuinely think our audiences overlap almost exactly.
I would love to do an email list swap before [seasonal moment] - you send our offer to your list, we send yours to ours. Our list is around [X] subscribers with a [Y%] open rate.
It typically drives 200-400 new customers for both sides in a single send, at zero media cost. Worth a quick call this week to see if it makes sense?
Mention a specific number - your list size, a recent open rate, an outcome from a previous partnership. Founders respond to data more than enthusiasm. If you have not run a partnership before, be honest about that and frame it as a test with a defined window - a founder who ran one new customer acquisition experiment and can tell you what happened is more trustworthy than one who oversells the guaranteed results of something they have never done.
Send the pitch directly via Instagram DM, LinkedIn, or a personal email you can find through their website. Do not go through a contact form. Always propose a specific campaign window and a next step - "quick call this week" is better than "let me know if you are interested," which asks them to do all the scheduling work.
How to structure and track the deal
Measurement is what separates a partnership that compounds into a long-term acquisition channel from one that feels good but cannot be evaluated. These are the tracking steps for every campaign.
Create a unique UTM link for each partner campaign
Generate a UTM link for your landing page using the partner's brand name as the source, 'co-marketing' as the medium, and the campaign date or name. This gives you clean attribution in Google Analytics and Klaviyo. Every click from the partner's email or social post should carry this UTM. Do not share a generic link to your homepage - you will lose visibility on which customers came from the partnership.
Build a dedicated landing page for each partner
Create a landing page on your Shopify store that references the partner brand by name. 'Welcome, [Partner Brand] community - here is your exclusive 15% off offer' converts better than a generic homepage drop. It also allows the partner's audience to feel like they are receiving something specifically for them rather than being redirected to a standard shop experience. The page should load fast and go directly to a product or collection, not to your homepage.
Tag all partner-referred customers in Klaviyo
Add a custom property or tag in Klaviyo for every customer who converts through a partner campaign. Use the property to track: acquisition source (partner brand name), campaign date, and first-order value. At 90 and 180 days, pull this segment and compare their repeat purchase rate and LTV against your other acquisition channels. This is the data that tells you whether partnerships are genuinely worth prioritising.
Agree on reciprocal reporting within 14 days of the campaign
Both brands should share results with each other within two weeks of the campaign completing. Share new customers acquired, conversion rate from the partner's list, and total revenue generated. Transparency builds trust and makes the next partnership faster to agree. If one partner refuses to share results, that signals they did not get the outcome they hoped for and are unlikely to want to repeat it - useful information for you to have before proposing a follow-up.
Calculate true CAC including all funded costs
Your partnership CAC is not just time and effort. Include: the discount funded on all partner-referred orders (say 15% off on an average order of £30 means £4.50 per order in funded discount), design and copywriting time at cost, product samples if any were sent, and an allocation of your hourly rate for negotiation and execution time. Compare this true CAC against your Meta and Google CAC over the same period. Partnerships that come in at less than 60% of your paid media CAC and deliver comparable or higher LTV should be scaled, not treated as one-off experiments.
The three mistakes that kill brand partnerships
Scale mismatch without compensation
When a brand with 5,000 email subscribers tries to swap with a brand with 40,000, the larger brand gets almost nothing and loses interest in the partnership immediately. If you are the smaller brand and want to access a larger partner's audience, you need to compensate for the imbalance - either with a cash fee (uncommon), a more prominent placement in your channels for a longer period, or by adding additional value such as a joint product collaboration or exclusive product access. Be honest about the asymmetry upfront. A partner who agrees to a swap and then discovers the imbalance mid-negotiation is a partner you have probably lost permanently.
No exclusivity for the campaign window
Running a partnership email swap while the partner is simultaneously running identical swaps with three competing brands in the same week destroys conversion rates and dilutes the recommendation. Your offer is no longer exclusive; it is one of several competing claims on the same inbox. Always agree upfront that neither brand will run a co-marketing campaign with a directly competing brand in the same product category for a window of at least 21 days before and after your campaign date. This is a standard ask that any serious partner will agree to, and it makes both campaigns more effective.
Crediting existing customers as new acquisitions
The most common measurement error in brand partnerships is failing to filter for customers who were already in your database before the campaign. If the partner's list contains 500 people who are already on your Klaviyo list, and they buy through the partnership link, they will appear in your campaign analytics as conversions but are not genuinely new acquisitions. Before finalising any partnership results, cross-reference new orders from the campaign period against your pre-existing customer and subscriber list. Only count customers who were not already in your database as genuine partnership-sourced acquisitions. This is not about being overly conservative - it is about building measurement you can trust and scale from.
Identify your next acquisition lever
The free scorecard covers acquisition channels alongside email, conversion rate, and paid media. Three minutes to complete and it will show you which lever is most constrained right now. If you have never run a brand partnership, it will flag acquisition channel concentration as a risk.
If you want someone to map your partnership opportunities - which brands in your category you should be talking to, what format makes sense given your current list size, and how to pitch them - the Brand Growth Audit covers acquisition strategy across channels including partnerships, email, paid, and organic. Three days, Loom walkthrough, written report.
Frequently asked questions
What is a brand partnership in DTC e-commerce?
A brand partnership in DTC e-commerce is a structured arrangement between two or more non-competing brands to share audiences, distribution, or product for mutual growth benefit. Common formats include email list swaps, joint product bundles, co-branded content, and collaborative product launches. The defining characteristic is that both brands benefit from the other's existing audience trust, which makes conversions significantly more efficient than cold paid media. For DTC brands in drinks, beauty, and wellness, partnerships with complementary brands in the same lifestyle category are typically the highest ROI acquisition channel that most founders have not yet activated.
How do I find brands to partner with for co-marketing?
Start with your own customer base. Survey your top 200 customers and ask what other brands they buy from regularly. The brands that appear most frequently are your natural partners. Then look at who your customers follow on Instagram and which brands appear alongside yours in lifestyle editorial. You are looking for brands that share your demographic, price point, and values but solve a different problem. A functional hydration drink brand and a clean supplement brand serve identical customers without competing. DTC founder communities, Slack groups, and LinkedIn are also productive for outbound outreach to founders directly.
What is a co-marketing email swap and how does it work?
An email list swap is when two brands each send a dedicated email to their own subscriber list recommending the other brand, typically with an exclusive discount or offer for readers. Brand A sends an email to 10,000 subscribers recommending Brand B with a 15% welcome discount. Brand B does the same in reverse. No email addresses are shared. Both brands use unique UTM links and dedicated landing pages to track new customers acquired. A well-matched swap with comparable list sizes and engagement rates typically converts 3-8% of the partner's list into first-time buyers. CAC from a swap is usually 60-75% lower than cold paid acquisition because trust transfers from the sending brand.
How much should I expect to spend on a brand partnership?
Most early brand partnerships cost very little in cash. An email swap costs staff time to write the email and set up tracking. A co-created Instagram Reel costs whoever produces the content. A joint bundle may require product samples and design time. The main resource is founder or marketing time, typically 3-8 hours per campaign to source, negotiate, brief, and execute. More complex partnerships involving co-branded products or joint events require production budget, but these are later-stage plays. The most cost-efficient entry point is an email swap or a social media collaboration, where your primary cost is the offer funded by discount margin rather than cash outlay.
How do I measure ROI from a brand partnership?
Track partnership ROI using unique UTM parameters for every partner touchpoint, a dedicated landing page per partnership campaign, and a Klaviyo segment or tag for partner-referred customers. Measure: number of new unique customers acquired, CAC for the partnership (all costs including discount funded, design, and time at your hourly rate), and 90-day LTV of partner-referred customers versus your channel average. Partner-referred customers frequently have 15-25% higher 90-day LTV because they arrived through a trusted recommendation rather than a promotion-led ad click. Compare true CAC and LTV against your Meta and Google baselines to evaluate channel efficiency.
Should my brand partnership be exclusive?
For campaign-level exclusivity, yes. Ask the partner not to run another brand swap or collaborative promotion in the same product category for a window of 30-60 days around your campaign. This protects your conversion rate and the exclusivity of the offer you are promoting to their audience. For longer-term exclusivity at a strategic level, only negotiate this if you are offering the partner something in return, such as a featured placement in your welcome series, a co-branded product, or a guaranteed minimum order volume. Blanket exclusivity agreements without compensation are rarely honoured and create friction that slows down the partnership before it even starts.
About the author
Caner Veli founded and exited Liquiproof, scaling from zero to 3,000+ retailers globally in under 6 years. He now runs Purposeful Profits, a focused growth consultancy for founder-led DTC and CPG brands. 12 named sprint clients. 518% average growth. 27x highest ROAS. Read more about Caner →