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This preparation meets United States Pharmacopeia (USP) standards for non-pyrogenic sterility and is formulated with benzyl alcohol as the bacteriostatic preservative agent to permit repeated aseptic withdrawals from the vial without microbial contamination

PMID: 18061177 PepT1-Mediated Tripeptide KPV Uptake Reduces Intestinal Inflammation Guillaume Dalmasso, Laetitia Charrier-Hisamuddin, Hang Thi Thu Nguyen, Yutao Yan, Shanthi Sitaraman, and Didier Merlin ~ Inflamm Bowel Dis

The other work he did was on gastric juices of dogs

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