Ingredient interaction protection

The problem

This is the failure mode that gets misdiagnosed most often. Every ingredient in the blend is within specification on arrival. Nine months later the vitamin C is low, the oil has oxidised and the flavour has drifted — and the ingredient responsible is perfectly stable itself.

Iron is the usual culprit. It is not degrading; it is catalysing the degradation of everything around it. Because the iron assay is fine, the investigation often looks in the wrong place for months.

Why the conventional ingredient fails

Iron salts are redox-active. In direct contact with oxidation-sensitive material in a dry blend — and particularly in the presence of residual moisture — they catalyse oxidation at rates far above the intrinsic degradation of the affected ingredient. No amount of specification tightening on the iron itself changes this, because the iron is behaving exactly as iron behaves.

The usual workarounds are expensive: overage on the degrading ingredient, splitting the product into two dosage forms, or removing the interaction pair entirely and losing the formulation you wanted.

How NexaGens addresses it

Physical separation within a single blend. Coating or pelletising the reactive ingredient puts a barrier between it and its neighbours, so the two can share a capsule or sachet without sharing an interface. The barrier has to survive blending and filling to be worth anything — which is why coating integrity after processing matters more here than almost anywhere else.

Relevant products

What to specify, and how to test it

Interaction protection is the hardest of these claims to substantiate, because it requires testing the blend rather than the ingredient.

• A blend study, not an ingredient study. Protected iron plus the sensitive partner, against unprotected iron plus the same partner, stored under the same conditions.
• The assay that matters is the partner’s — vitamin C retention, peroxide value on the oil, flavour panel — not the iron’s.
• Realistic moisture. Interaction accelerates sharply with water activity. A study run dry will overstate the protection.
• Coating integrity after blending and filling. Mechanical damage during processing reopens the interface. Ask for post-process data.
• Elemental iron content stated separately from the salt assay — you need it to calculate the label claim, and the two are routinely confused.
• Realistic storage duration. Interaction effects are cumulative; three months will not show what twelve months will.

For the NexaGens products above, interaction-protection test design and acceptance criteria form part of the product specification, and each production batch is supplied with a batch-specific certificate of analysis.

Next steps

See the interaction-protected pellets · Describe your blend to our technical team