Whey protein is the most common powder supplement category in the world, and one of the most common products we run at Overgang. It's also where we see consistent preparation mistakes from brands on their first run. This guide covers everything specific to running whey protein on a horizontal form fill seal machine.

Fill Weight Considerations

Whey protein concentrates and isolates have relatively consistent bulk densities, but your formula's overall density depends on what else is in the blend. A pure WPC-80 will fill differently than a whey isolate blend with added flavor systems, allulose, digestive enzymes, or fiber.

Typical fill weights for whey protein sachets:

Always do a small blend test before committing to a full run. The way a formula behaves in a 5-gallon bucket during development is different from how it flows through an auger at production speed.

The Hygroscopic Factor in Whey Blends

Pure whey protein isolate is moderately hygroscopic — it will pick up ambient moisture over time but isn't as aggressive as some other ingredients. The blend becomes more complex when you add:

Tell your co-packer about every ingredient in your formula before your run, not just the primary protein. The interaction between ingredients matters more than any single ingredient's hygroscopic behavior in isolation.

At Overgang, we run freeze-dried products regularly — some of the most hygroscopic powders in the category. A standard whey protein blend at normal inclusion rates is generally not a concern for our machine and facility setup. Unusual ingredient combinations get discussed during onboarding.

Allergen Declaration — Non-Negotiable for Whey

Whey protein is derived from milk. That makes every whey protein product a dairy allergen product. Before Overgang will run any whey protein formula, we require:

This protects you as much as it protects us. An unlabeled dairy allergen on a supplement product is a serious compliance violation and a potential recall.

COA Requirements for Whey Protein

Whey protein is one of the most adulterated ingredients in the supplement industry. Nitrogen spiking — where manufacturers add cheap amino acids or non-protein nitrogen compounds to inflate apparent protein content on a nitrogen-basis assay — is a well-documented problem.

Your COA for whey protein should include:

If your supplier's COA only shows a Kjeldahl nitrogen test without amino acid breakdown, push for more documentation. It's the only way to verify you're getting real protein — not protein content inflated by non-protein nitrogen compounds.

Sachet Sizing for Whey Protein

The most common issue we see with first-time whey protein runs is sachets that are sized too small for the fill weight. Whey protein blends are typically light and fluffy — a 30g sachet of protein blend takes up more physical volume than a 30g sachet of something denser like creatine.

Rule of thumb: get a sachet sizing session before you order film. We can run a small test with your actual formula or a surrogate powder to confirm that your target pouch size accommodates your fill weight with appropriate headspace for a clean top seal. Getting this wrong after you've printed 50,000 feet of film is an expensive lesson.

Lot Numbers and Expiration Dates

Whey protein products typically carry a 12–24 month shelf life depending on the formula and packaging. Before your run, you need to provide:

We apply lot numbers and expiration dates per your specification. We don't set these — you do. Have this ready before your run date.