An older adult client who has type 2 diabetes mellitus (DM) and a history of heart failure (HF) tells the home health nurse that his daughter brought him melatonin to help with sleeping problems. Which information should the nurse provide to the client? Select all that apply.

A. Herbal supplements can interact with prescription medications and may have side effects. It is essential to consult the healthcare provider to ensure safety and avoid harmful interactions, especially in clients with complex conditions like diabetes and heart failure. B. Unlike prescription drugs, herbal supplements are not rigorously tested or regulated for safety, efficacy, or quality. This lack of regulation can lead to variability in product content and unexpected adverse effects. C. Not all herbal supplements are ineffective; some may provide benefits, though they require careful consideration and medical guidance. Advising that all are unhelpful is inaccurate and dismisses potentially safe options when appropriately supervised. D. Melatonin may affect blood pressure, blood sugar levels, and interact with heart failure medications, potentially altering their effectiveness or causing adverse effects. Clients should be informed about these risks. E. The body builds up a tolerance of melatonin, requiring higher doses to get therapeutic benefits: Current evidence does not strongly support tolerance development to melatonin requiring dose escalation. The need for higher doses is not a concern in short-term melatonin use.