Weak Back. Simple Remedy for

"Aching may be relieved by taking a large pinch of buchu leaves, steep and drink. Sweeten if desired. Use a pint of water for steeping the leaves." This is a good remedy for a weak back, resulting from kidney trouble. The buchu leaves acts quickly on the kidneys and it is surprising to see how quickly the backache will disappear. You can purchase a two ounce package for five cents at any drug store.

Source: Mother's Remedies: Over One Thousand Tried and Tested Remidies from Mothers of the United States and Canada, T. J. Ritter