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Instead, it signals that the FDA requires more clinical data and formal review

11 BeyerT.BidautL.DicksonJ.KachelriessM.KiesslingF.LeitgebR.et al (2020)

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Whether systemic injection delivers ascorbic acid to the dermis in concentrations that meaningfully exceed what the body achieves through normal dietary intake has not been established in controlled skin-outcome studies

Concurrently, the vascular system also grapples with managing the byproducts of oxidative stress generated from both the peripheral circulation and metabolic processes within the brain tissue

That's not to say Doctor's Best doesn't do allergen testing or take other measures to ensure consumer safety, only that the information isn't readily available