It is a good source of beta-carotene, plant acids, tannins, omega-fatty acids flavonoids, minerals, B-vitamins, and vitamin C.
 
Black and English walnuts are melatonin, folate, pectin, and various types of minerals such as phosphorous, calcium, magnesium, iron, manganese, potassium, silicon, selenium, and zinc. 
 
These components have been linked with improved lipid profiles, increased plasma antioxidant capacity, endothelial function, and neuroprotective action.
The predominant B vitamins like cobalamin (B12), folate (B9), and pyridoxal phosphate (B6) in walnuts exhibit a vital role in detoxifying methionine derived amino acid homocysteine which has atherothrombotic properties.
Finally, the black walnut contains slightly higher levels of arginine in comparison to the English walnut which has been related to lowering of blood pressure by acting as a precursor for the endogenous vasodilator, nitric oxide (NO)
 
Anti-Microbial.
Expels Parasites.
Improves Cardiovascular Health
Helps Protect Against Cancer
 
Promotes Healthy Skin: The tannins in black walnut have an astringent effect, which is used to tighten the epidermis, mucous membranes and relieve irritation. Dermatological applications associated with black walnut include viral warts, eczema, acne, psoriasis, xerosis, tinea pedis and poison ivy.
 
Other constituents found in black walnut include: (11)
1-alpha-tetralone derivative
(-)-regiolone
Stigmasterol
Beta-sitosterol
Taxifolin
Kaempferol
Quercetin
Myricetin
 
In addition, one ounce (28 grams) of black walnuts contains about: (12)
173 calories
2.8 grams carbohydrates
6.7 grams protein
16.5 grams fat
1.9 grams fiber
1.1 milligrams manganese (55 percent DV)
0.4 milligram copper (19 percent DV)
56.3 milligrams magnesium (14 percent DV)
144 milligrams potassium (14 percent DV)
0.2 milligram vitamin B6 (8 percent DV)
4.8 microgram selenium (7 percent DV)
0.9 milligram zinc (6 percent DV)
0.9 milligram iron (5 percent DV)