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A rigorous 2026 UK evidence review covering the Read the full review Neuroscience 23 April 2026 Dihexa for Long COVID Brain Fog: Neuroinflammation & Synaptic Pruning (2026) Can Dihexa help Long COVID brain fog

The "for research purposes only" designation means: No manufacturing requirements: No clean room requirements No mandatory testing No batch records No recall systems Quality varies enormously: Some suppliers provide high-quality products Others sell underdosed, contaminated, or degraded peptides No way to know without independent testing Third-party testing through services like Janoshik can verify research peptide quality, but adds cost and doesn't guarantee sterility since testing typically occurs on samples rather than the specific vial you'll use

Researchers at higher maintenance doses often prefer 20mg vials because they last longer and reduce the frequency of reconstitution

As a precautionary measure, the medication is contraindicated in patients with a personal or family history of medullary thyroid carcinoma or Multiple Endocrine Neoplasia syndrome type 2

The Pharmacy Compounding Advisory Committee (PCAC) voted on Thursday 8-6 in favor of the move with one abstention