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    Ingredient guide · Ingredient reference

    Vitamin A in an autism pilot: marker changes did not improve scale scores

    A before-and-after study found changes in retinol and selected biological measures without significant changes on autism-related scales. It does not establish vitamin A as an autism treatment.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    What the source establishes

    Sixty-four children completed a six-month vitamin A intervention study. Investigators compared their own baseline and follow-up measures; gut-microbiome analyses involved a subset of twenty. [1]

    Retinol and selected gene-expression measures increased. Some microbial proportions changed, but the three reported behavioral or social rating scales did not significantly change. [1]

    What it does not establish

    The authors declared no competing interests; funding was not established from the abstract. The study lacked a randomized placebo comparison and was retrospectively registered. Biological changes cannot be treated as evidence of improved functioning or used to justify unsupervised high-dose supplementation. [1]

    A hypothetical distinction

    Imagine a laboratory value changes while the outcome important to the person remains unchanged. The laboratory result can guide further research without establishing an effective treatment.

    Evidence summary — Vitamin A in an autism pilot
    DetailInterpretation
    Before-and-after designNo randomized control
    Biological measuresChanged
    Rating scalesNo significant change
    Vitamin A in an autism pilot: marker changes did not improve scale scores — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Effect of vitamin A supplementation on gut microbiota in children with autism spectrum disorders - a pilot study - PubMed
      Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.