Extensive health and safety studies conducted at the Noguchi Memorial Medical Research Centre in Ghana have shown that Moringa leaves are not toxic and have no toxic elements. Even when consumed in concentrated forms, no adverse side effects were observed.
However, it's worth noting that Moringa leaves are high in fiber and consuming large amounts may cause digestive discomfort such as bloating, gas, or diarrhea, similar to other green leafy vegetables. It's recommended to consume Moringa leaves in moderation and to consult with a healthcare provider before adding them to your diet, especially if you have pre-existing medical conditions or take medication.
Overall, Moringa leaves are a nutritious and safe superfood that can provide many health benefits when consumed as part of a balanced diet.
(source from http://www.treesforlife.org/our-work/our-initiatives/moringa)