According to Shennong's Classic of Materia Medica, it is warm in skin, sweet in taste and non-toxic, and has the effects of invigorating stomach, enriching blood, moistening lung and nourishing heart.

Skin contains essential trace elements such as zinc, manganese and chromium, which can resist aging, promote glucose utilization and cholesterol metabolism, and protect cardiovascular function.

Walnut kernel has the effects of "benefiting qi and nourishing blood, moistening dryness and resolving phlegm, benefiting qi and nourishing yin, treating triple energizer, warming lung and moistening intestine, treating deficiency cold, asthma and cough, severe pain in waist and feet, heart hernia, blood dysentery and intestinal wind".

It is recommended not to lose the thin skin when eating walnuts. Eating walnuts with a belt will be healthier.