Introduction: Bioactive compounds with antioxidant potential are excellent alternatives for dietary supplements for the elderly population, as they help to mitigate the chronic inflammatory state associated with advancing age, which is one of the main causes of metabolic changes that occur during aging. In this regard, ensuring adequate nutrition for the elderly is very important and functional drinks can be of great help. Objectives: Measure the content of phenolic compounds and flavonoids of two formulated functional beverages (F7 and F8), comparing these values ​​with previous results found in the scientific literature for functional fruit beverages. Methodology: The formulations, F7 and F8, were prepared from concentrated oat extract, aqueous turmeric extract, whey protein powder and freeze-dried banana and strawberry, with the only difference between them being the content of concentrated oat extract (20% and 30% m/v, respectively) and were previously tested in preliminary sensory analysis from a total of 40 initial formulations. The total phenolic content was determined by the Folin-Ciocalteau method. The total flavonoid content was measured according to the method described by Taie et al. (2018) with modifications. The values ​​obtained were statistically compared with each other. Results: The total phenolic compound content was 614.4 ± 36.1 and 689.4 ± 80.1 μg GAE/g in formulations F7 and F8, respectively. The total flavonoid content was 101.7 ± 1.4 and 52.9 ± 0.8 μg Quercetin/g in formulations F7 and F8, respectively. There were no statistically significant differences in the phenolic compound and total flavonoid content between the formulations analyzed. The composition is related to the presence of components with antioxidant potential such as turmeric extract (1184.8 ± 0.2 μg GAE/g and 7270.3 ± 590.0 μg Quercetin/g, respectively). Conclusion: The prepared formulations presented a high content of total phenolic compounds and flavonoids, proving to be a good source of these healthy compounds if applied as supplementation in the diet of elderly people.