Fig S1: CONSORT diagram for the flow of participants through each stage of the trial for video assessment.

Table S1: Horse subject details and trial details for the 50 horses initially enrolled.

Table S2: Progression of horses through each stage of the trial.

Table S3: Video scores for each horse.

Table S4: Average (of the 2 raters) video scores at pretreatment and while on the supplement and the placebo.

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