<![CDATA[Older adults are at increased risk of noncommunicable diseases, including diabetes mellitus (DM) and hypertension, highlighting the need for accessible and practical health education. This community service activity aimed to improve health-related knowledge among older adults regarding DM, hypertension, herbal plants, bioactive compounds, and the appropriate use of natural ingredients through health education and functional beverage training. The activity was conducted as a community service program with quantitative evaluation using a one-group pretest–post-test design among 20 older adults in Mangunrejo Village. The activities included education on DM, hypertension, herbal plants, bioactive compounds, and the appropriate use of herbal ingredients, followed by training in the preparation of infused water using lemon, cucumber, and cinnamon. Participants’ knowledge was assessed using a 20-item true/false questionnaire before and after the activity. Data were analyzed using the Wilcoxon signed-rank test at α = 0.05. The mean knowledge score increased from 9.85 ± 1.23 (49.25%) in the pretest to 16.15 ± 1.46 (80.75%) in the post-test representing an absolute improvement of 6.30 points or 31.50 percentage points (p < 0.001). All participants showed increased post-test scores. These findings indicate an improvement in health-related knowledge following the community service activity. However, the one-group design, limited number of participants, and immediate post-test assessment limit the ability to establish causal effects or determine changes in health-related behavior and long-term outcomes.]]>
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