"Say what you will about American food, at least we Yanks haven't afflicted the world with calamities like haggis, the Scottish staple made of boiled sheep's stomach, or hakarl, an Icelandic offering of putrid shark. In fact, it's hard to think of a down-home American recipe that would warrant inclusion in The Joy of Cooking a Dog's Ex-Breakfast - the obvious title for a collection of demented dishes like haggis. Unless, that is, you happen to know about the human-hair extract in U.S. baked goods, the crushed-insect residue in many of our foods, and the flavorings made with ... something unimaginable."
Human Hair Waste is used as a source of amino acids. You may recognize some of these from food ingredient labels.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.