While FitSpresso is formulated with natural ingredients, some users might experience mild side effects. Common FitSpresso reviews and complaints include digestive discomfort, such as bloating or gas, particularly during the initial days of consumption. Another potential side effect is insomnia, attributed to the caffeine content in green tea extract. It’s recommended to monitor your body’s response and consult a healthcare professional if adverse effects persist. Users have shared their experiences in various FitSpresso reviews consumer reports and FitSpresso customer reviews, which can provide further insights into managing these side effects.