ALC-0315 Toxic Metabolites: Pharmacokinetic and Regulatory Criticalities in a COVID‑19 “mRNA Vaccine”

Authors

  • Gabriele Segalla Multichem R&D

DOI:

https://doi.org/10.56098/q9fgvp96

Abstract

ALC-0315, the ionizable cationic lipid enabling the Pfizer vaccine Comirnaty’s LNP platform, is presented in regulatory files as if its metabolic fate were straightforward and well controlled. Our analysis instead identifies a basic, consequential discrepancy that should never survive dossier assembly — let alone review: the hydrolysis product dictated by the ALC-0315 chemical structure is 2-hexyldecanoic acid (α-branched), yet key submissions by Pfizer repeatedly invoke the presence of distinct 6-hexyldecanoic isomer (not commercially available, not recognized as an analytical standard in established analytical protocols). This is a material misidentification with direct safety and compliance consequences. The authentic metabolite, 2-hexyldecanoic acid, concealed by Pfizer and disguised as 6-hexyldecanoic acid, carries an H410 classification (very toxic to aquatic life with long-lasting effects), while the “phantom” 6-hexyl isomer is lacking any hazardous classification and presented as theoretically more degradable. In a CMA supporting pivotal preclinical study, substituting 2-hexyl with an unclassified 6-hexyl isomer materially compromises the clearance account, traceability, and any defensible claim of GLP grade validation for Pfizer’s vaccine. The second breakdown product (a trialkanolamine, pKa ≈ 9.6) is liable to lysosomal sequestration, thereby impeding clearance; however, the company dossier offers only limited substantiation of its disposition. Critically, the pharmacokinetic dataset does not adequately account for dose biodistribution and is predicated on insufficiently documented — or omitted — testing standards. Given the scale of exposure (billions of subjects) and the potential oncological and cardiological consequences placed on these PK criticalities, these omissions are not merely unfortunate; they are utterly unacceptable. Accordingly, we call for an independent, methodologically transparent and fully auditable re-assessment of ALC 0315 metabolism and clearance, and for all regulatory decisions concerning the Comirnaty medicinal product to be reconsidered in view of what appears to amount to a grave and consequential omission in verification procedures.

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2026-05-18

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ALC-0315 Toxic Metabolites: Pharmacokinetic and Regulatory Criticalities in a COVID‑19 “mRNA Vaccine”. (2026). International Journal of Vaccine Theory, Practice, and Research , 4(2), 1673-1699. https://doi.org/10.56098/q9fgvp96