Banned-substance testing: what sports nutrition customers will ask you to prove

An athlete is responsible for everything in their body, whatever the label said. That principle pushes an unusual burden back up the supply chain, and ingredient suppliers who understand it are easier to sell to sports brands.

The risk is cross-contamination, not formulation

Nobody reputable is adding prohibited substances deliberately. The realistic risk is trace carryover — shared equipment, shared facilities, a raw material that passed through a site also handling prohormones or stimulants. The quantities involved are far below anything that would affect a product's performance, and far above the threshold that produces an adverse finding in an athlete's sample.

This is why routine QC misses it. Standard testing looks for the specification's own parameters. It does not screen for several hundred unrelated compounds at nanogram levels.

What buyers in this segment actually ask for

• Batch-level screening against a recognised programme — Informed Sport and BSCG are the two most often named. Testing is per batch, because contamination is a batch event, not a site characteristic.
• A facility declaration stating what else is handled on the same lines, and the changeover and cleaning validation between products.
• Full traceability to the raw material lot, so a positive finding can be traced rather than argued about.
• Retained samples held for the shelf life of the finished product, so a challenge years later can be investigated against the actual material.

Ingredients that attract the most scrutiny

Botanical extracts and pre-workout ingredients draw the closest attention, because plant materials have historically been where undeclared stimulant analogues turn up. Amino acids, creatine and protein carry lower inherent risk but are shipped in the largest volumes, so a contamination event has the widest reach.

What this means commercially

Batch screening costs money and takes time, and it should be quoted as what it is — a per-batch cost, not a certificate the supplier holds. A supplier who claims to be "Informed Sport certified" as a blanket status has misunderstood the programme, and that misunderstanding is itself informative.

If you supply into this segment, agree three things in the contract: who pays for screening, what the lead time is with screening included, and what happens to a batch that fails. Sorting that out in advance is considerably cheaper than sorting it out during a recall.