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Historically, excipients were considered inert substances like sugar or starch. In 2026, the industry has adopted the term Biofunctional Excipients to describe molecules that actively protect the therapeutic integrity of a drug.

For complex biologics, these excipients serve as "molecular bodyguards." They prevent the active protein from denaturing (unfolding) or sticking to the walls of glass vials, which could render the medicine useless or even dangerous. By 2026, the selection of an excipient is no longer a secondary thought but a primary part of the drug’s patent strategy, as the right excipient can extend a drug’s shelf life by years.