Hi, Testoki tablet contains testosterone that is used to treat male hypogonadism which is caused by low levels of testosterone. This medication can help to restore testosterone levels in someone s body who has low levels of testosterone. Side effects of Testoki are nausea, vomiting, stomach pain, headache, diarrhea, increased sweating, dizziness, acnes, breast tenderness and enlargement, changes in body weight, dry mouth, leg pain, hair loss, changes in sleep patterns, allergic reactions etc. Nano Leo contains natural ingredients which is used to improve sexual health in men. It may help to improve erections and longevity in sexual activities. It may be used to treat erectile dysfunction of men and restore testosterone levels in the body. Side effects of Nano Leo are nausea, vomiting, diarrhea, abdominal pain, headache, dizziness, restlessness, palpitations, abdominal bloating, GIT upset, changes in sleep patterns, weakness, fatigue, loss of appetite, risk of heart attack, gout, worsening of asthma status, allergic reactions etc. If these side effects from these medications last for long or bother you, then you should consult your doctor immediately for medical help. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician