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Objective: We hypothesised that an alternative RUTF (ready-to-use therapeutic food) made with oats (oat-RUTF) would be non-inferior to standard RUTF (s-RUTF)., Design: This was a randomised, triple-blind, controlled, clinical non-inferiority trial comparing oat-RUTF to s-RUTF in rural Sierra Leone. Children aged 6-59 months with severe acute malnutrition (SAM) were randomised to oat-RUTF or s-RUTF. s-RUTF was composed of milk powder, sugar, peanut paste and vegetable oil, with a hydrogenated vegetable oil additive. Oat-RUTF contained oats and no hydrogenated vegetable oil additives. The primary outcome was graduation, an increase in anthropometric measurements such that the child was not acutely malnourished. Secondary outcomes were rates of growth, time to graduation and presence of adverse events. Intention to treat analyses was used., Results: Of the 1406 children were enrolled, graduation was attained in 404/721 (56%) children receiving oat-RUTF and 311/685 (45%) receiving s-RUTF (difference 10.6%, 95% CI 5.4% to 15.8%). Death, hospitalisation or remaining with SAM was seen in 87/721 (12%) receiving oat-RUTF and in 125/685 (18%) receiving s-RUTF (difference 6.2%, 95% CI 2.3 to 10.0, p=0.001). Time to graduation was less for children receiving oat RUTF; 3.9±1.8 versus 4.5±1.8 visits, respectively (p<0.001). Rates of weight in the oat-RUTF group were greater than in the s-RUTF group; 3.4±2.7 versus 2.5±2.3 g/kg/d, p<0.001., Conclusion: Oat-RUTF is superior to s-RUTF in the treatment of SAM in Sierra Leone. We speculate that might be because of beneficial bioactive components or the absence of hydrogenated vegetable oil in oat-RUTF., Trial Registration Number: NCT03407326., Competing Interests: Competing interests: DTH, MJM, CG, AL, DW, MC-G and MM report grants from Children’s Investment Fund Foundation paid to their university., (© Author(s) (or their employer(s)) 2020. No commercial re-use. See rights and permissions. Published by BMJ.)