Copper deficiency 

Copper helps form hemoglobin and collagen in the body.

Copper deficiency symptoms can include increased parasitic infections, weakness from anemia and leaky gut.
Copper must stay in balance with zinc and iron in the body as well and if you consume too much of one it can throw the others out of balance.
The RDA for copper is 900 mcg/day. The Daily Value is 2 mg.

Copper foods list

  Copper Rich Foods 

1) Beef liver3 oz: 14 mg (over 100% DV)
2) Dark chocolate1 square: 0.9 mg (45% DV)

3) Sunflower seeds¼ cup: 0.63 mg (31% DV)
4) Almonds¼ cup: 0.4 mg (20% DV)
5) Dried apricots1 cup: 0.69mg (34% DV)
Copper is an essential mineral required by the body for bone and connective tissue production, and for coding specific enzymes that range in function from eliminating free radicals to producing melanin. 

A deficiency in copper can lead to osteoporosis, joint pain, lowered immunity. 
 Conversely, over-consumption of copper will lead to cramps, diarrhea, and vomiting in the short term, and can lead to depression, schizophrenia, hypertension, senility, and insomnia in the long term. Copper in large amounts can even be poisonous. The stomach needs to be acidic in order to absorb copper and thus antacids interfere with the absorption of copper, as do milk and egg proteins. The current DV for copper is 2mg. Below is a list of high copper foods, for more, see the lists of high copper foods by nutrient density, and copper rich foods.

Copper is essential for the absorption of iron, anemia.

Copper in 100gPer cup puréed (230g)Per avocado (201g)
0.19mg (10% DV)0.44mg (22% DV)0.38mg (19% DV)
Half an average avocado contains 161 calories. Click to see complete nutrition facts.

 Seeds (Sesame Seeds)
Copper in 100gPer cup (144g)Per ounce (28g)
4.08mg (204% DV)5.88mg (294% DV)1.14mg (57% DV)
Other Seeds High in Copper  Sunflower Seeds (26%), Pumpkin & Squash Seeds (19%), Flaxseeds (17%), and Watermelon Seeds (10%). Click to see complete nutrition facts.