Why You Should Think Twice About Supplementing Minerals If you found value, then please share! Cardon, Johan Elias (1802 – 1878), Gahn Johan Gottlieb, marked as public domain, more details on Wikimedia Commons You said that a safe level of copper supplementation is around 2 mg, and I’m curious to know if there’s anything regarding manganese toxicity.High levels can cause Parkinson’s-like symptoms, and I know that manganese competes with iron for absorption, so there could be some advantages of disadvantages to this depending on the iron content of the diet.Do you know a safe amount to supplement? Dave Foster, April 20, 2016 I would no go beyond 10mg daily. I think Dr. Ray Peat said that he is more comfortable with 5mg and not for extended periods of time, just like zinc.Georgi Dinkov, April 21, 2016 Last Updated on October 21, 2019 Please Share This You Might Also Like Can You Refrigerate Your Vitamins? March 1, 2020 T3-Laden Ratio Signs January 8, 2020 How To Make Your Own Magnesium Supplement March 1, 2020 Leave a Reply Cancel reply Save my name, email, and website in this browser for the next time I comment.