In Chinese medicine Blood is a condensed a dense form of Qi. It is derived from the food we eat and air we breathe. The Spleen, Lungs and Heart all aid in production of Blood.
Blood provides nourishment and moisture to the entire body. It provides the fuel for movement and keeps muscles, skin and hair healthy. Having sufficient blood also nourishes the mind and keeps our reactions and memory sharp.
If your memory is poor, skin, hair and nails dull and limbs weak and fatigued Blood deficiency may be involved.