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Glossary · Protein Powders

Amino Spiking

Amino (or protein) spiking is adding free amino acids like glycine and taurine, or non-protein nitrogen, so a label's protein figure reads higher than the intact, complete protein actually justifies — standard nitrogen tests count them all as "protein." It was a documented industry problem, and the defenses are practical: prefer brands that publish a full amino-acid profile or third-party testing, and be skeptical of a suspiciously cheap powder claiming top-tier protein per serving. Where a brand publishes the breakdown, we read it; where it does not, the review says so.

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