The body builds up a tolerance of melatonin, requiring higher doses to get therapeutic benefits.

Tell the daughter to check with the healthcare provider before providing herbal supplements,

Remind the daughter that all herbal supplements will not be helpful given the condition of the client.

Remind the client that herbal medications are not regulated by the Food and Drug Administration.

Explain that melatonin can interfere with the action of prescribed medications for DM and HF.