Five things quietly killing your supplement brand's margins — that aren't your co-packer.

Co-packing gets blamed for a lot. And sometimes it deserves it — opaque pricing, hidden fees, and rigid minimums are real problems in this industry. But after talking to hundreds of supplement brand founders, the margin problems that actually kill brands usually aren't the co-packer's fault. They're structural. They compound quietly. And by the time you see them in a P&L, they've already done serious damage.

Here are five of the most common ones.

1. Carrying Too Much Inventory

The math that gets founders: tolling cost per unit looks better at 20,000 units than at 5,000. So they order 20,000. They ship 3,000 in the first three months. The remaining 17,000 units sit in a 3PL warehouse at $25–$50 per pallet per month, accruing storage costs, tying up capital, and sitting through a product refresh cycle that means some of it will never sell at full price.

The real cost of that "cheaper" per-unit rate at 20,000 units:

• Additional capital deployed vs. a smaller run: $15,000–$25,000
• Storage costs over 12 months on unsold inventory: $600–$1,200
• Opportunity cost on capital that could be funding marketing: significant
• Risk of inventory obsolescence if formula changes: potentially all of it

The per-unit cost saving at high volume is real. The total cost of capital tied in inventory you haven't sold is also real. Run the full math, not the tolling math.

2. The 3PL Platform Fee Trap

This one is particularly insidious because it's a fixed cost that looks small in isolation and enormous when calculated per order. A $400/month platform fee at 100 orders a month is $4 per order — before any pick, pack, or shipping charges. At 50 orders a month it's $8 per order.

We've talked to brands paying $600–$800/month in 3PL platform and software fees on 150 orders a month. That's $4–$5 per order in overhead before the box is touched. Add pick and pack, add shipping, and the all-in cost per order at that volume is often higher than the retail revenue on a single-unit purchase.

Platform fees are a growth-stage artifact that makes sense when you're doing 5,000 orders a month. They're a margin killer when you're doing 150.

3. Not Accounting for Yield Loss

Every powder co-packing run loses product to yield. Startup waste, material coating the fill system, out-of-spec pouches pulled during quality checks. The typical range is 5–10% depending on run size and formula.

If you order ingredients for exactly 5,000 units and yield is 8%, you're getting approximately 4,600 pouches — 400 short of what you planned to sell. You've already paid for those ingredients. You're just not getting the sellable product from them.

Brands that don't account for yield loss consistently come up short on inventory against their sales projections. The fix is simple: order ingredients at 108–110% of your expected finished output. But the fix only works if you know about the problem first.

4. Underpricing Samples and Trial Units

Sampling is important. Influencer seeding, retailer samples, PR gifting — it's all real marketing spend. The problem is when brands treat sample units as "free" because they were already produced. They're not free. They have a landed cost: production, ingredients, fulfillment. Sending 500 units to influencers at $1.20 all-in cost per unit is $600 in real spend that needs to be in your marketing budget, not treated as overhead.

More importantly, sample programs that convert poorly — because the brand isn't tracking which influencers or channels drive actual sales — are one of the most common ways supplement brands burn cash without understanding why their return on marketing spend looks poor.

5. Getting Locked Into the Wrong Co-Packing Agreement

Not all co-packing agreements are equal. The things that quietly kill margins in co-packing contracts:

• Annual volume commitments — you agreed to 100,000 units over 12 months. You sold 40,000. You owe the difference, or you've committed future production that ties up cash.
• Exclusive ingredient sourcing requirements — some co-packers require you to source ingredients through them. Their ingredient margins can be significant. You're paying tolling plus ingredient markup without realizing it.
• Automatic price escalation clauses — tolling rates that adjust annually by a fixed percentage regardless of market conditions. Fine when they're below inflation. Problematic when they compound over three years.
• No make-good provision — what happens when a run doesn't meet spec? If your MSA doesn't have a clear answer, you're negotiating from a weak position after the fact.

We publish our pricing and our fee schedule before you sign anything. That's intentional. Surprises in co-packing agreements are one of the primary ways margin gets destroyed in this industry — and we've been on the receiving end of that as customers. We're not interested in recreating it.

The Common Thread

Every one of these margin killers shares the same root: a cost that seemed small or invisible at commitment time, that compounds over months until it's material. The fix isn't complicated — it's building a real cost model that includes storage, yield loss, platform fees, sample spend, and contract terms alongside tolling and ingredients.

If you want to build that model, we'll help. We'd rather have clients who understand their full cost structure than clients who are surprised by their P&L six months into a product launch.