She added only a drop this time. Lemon juice has been shown to stimulate salivary flow and support digestive processes by increasing gastric acid secretion, which may aid digestion when used in small amounts (Penniston et al. 98). Citrus compounds also provide vitamin C, which contributes to immune support and antioxidant activity (Carr and Maggini 7). She diluted it well and paid attention to the way it felt instead of the promise behind it.