3. Rhubarb Leaves
Oxalic acid is the substance that makes rhubarb leaves toxic. The plant is not as harmless as you might thing so be careful with it. Oxalic acid builds stones in the kidneys so refrain from eating too much of the stalks and leaves. These parts of the plant are toxin both when raw and cooked. If eaten in large amount, rhubarb leaves cause vomiting, nausea, diarrhea and abdominal pain.
4. Nutmeg
Nutmeg powder is used for baking and cooking. We need just a small dose of the product to make dishes taste different. Do not consume more than 0.2 oz of nutmeg powder – over dosage can cause hallucinations and convulsions. Always pay attention as to how much of nutmeg you consume.