If a rash, hives, swelling, or trouble breathing shows up, stop use immediately and seek medical care
Note: Avoid mixing with high-concentration Vitamin C (L-ascorbic acid) or strong acids in the same step, as they may destabilize the copper ions
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[6] [3] [10] A mild deficiency may not cause any discernible symptoms, but moderate deficiency can cause various symptoms, such as feeling tired, lightheadedness, headaches, cold intolerance, pale skin, sore tongue, upset stomach, loss of appetite, hair and skin color changes, numbness or tingling (pins and needles) of the fingers and toes, and tinnitus, and vision, cognitive or psychological problems
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it is also an essential factor in the growth and operation of brain and nerve cells