It is generally used for barbecues. Judging from the parts where sheep fat is produced, it is called fat skin and waist fat in jargon. Fat skin is the layer of white oil skin that wraps the internal organs when the sheepskin is opened. Yain oil is the fat that coats the kidneys of sheep, and most of the oil on sheep is produced here.

Sheep oil is sweet, warm and non-toxic; it has the functions of tonifying deficiency, moistening dryness, dispelling wind and transforming toxins. It can be used to treat fatigue, weight loss, dry skin, chronic diarrhea, erysipelas, sores and ringworm. For oral administration, it can be dissolved in water and taken as a drink, and for external use, it can be mixed into a plaster and applied on it. Those with unclear external symptoms and excessive phlegm-fire should not use it as medicine.