Subtitles section Play video Print subtitles Miracle berries are generally considered safe with minimal side effects. However, some potential side effects may occur including: 1.Overconsumption of acidic foods: The active ingredient in Miracle Berries, miraculin, alters the perception of taste, making sour foods taste sweet. This might encourage people to consume these foods in larger quantities than usual. This could potentially be harmful, leading to issues like stomach upset or heartburn, especially if high-acidity foods are consumed in excess. 2.Long-lasting taste alteration: Some people have reported that the taste-altering effect of miraculin lasted longer than expected, in rare cases up to 18 hours. This could cause anxiety in some individuals, although the effect is temporary. 3.Unexpected flavor enhancement: There have also been instances where other flavors, such as saltiness, were enhanced, which could be problematic for people who weren't anticipating this effect.