I saw that there was a search by someone asking if Cuprum metallicum is safe. Yes, the homeopathic remedy Cuprum metallicum is safe. All homeopathic remedies are safe. What I am writing here applies to all homeopathic remedies.
That said, you still want to be respectful of homeopathic remedies. You take a homeopathic remedy when it is similar to what the person is experiencing. This is like cures like or the Law of Similars, the main principle of homeopathy. The homeopathic remedy is only homeopathic if it is similar to what the person is experiencing; it is not homeopathic if it is not similar. Homeopathy means similar (homo) suffering (pathy). If you take the remedy, one or two doses, and it is not helpful for you, it won’t hurt you. You want to stop taking that remedy then.
Homeopathic remedies are made in homeopathic pharmacies. The substance that the homeopathic remedy is made from, in this case Cuprum metallicum, is grounded up and then mixed with an alcohol/water solution. (Other substances may start in a mother tincture form.) A small part of this alcohol/water solution is diluted more, and then succussed (shaken vigorously and hit against something hard. Hahnemann used a bible). This dilution and succussion process is done many, many times creating the strength or potency of the homeopathic remedy. At the 12c potency, and the higher potencies, there is nothing left of the physical substance of which the homeopathic remedy is made from, in this case Cuprum metallicum. It is the energetic pattern of the substance. This process is called potentization. This is the Minimum Dose that Dr. Samuel Hahnemann developed in the late 1790’s, another principle of homeopathy.
Copper A vial of Cuprum metallicum 12C
During Hahemann’s time, many of the medicinal substances used were poisons, actually it is still like that today. Hahnemann found that by making the dose as small as possible, as mentioned in the above paragraph, the medicinal substance was curative and healing; the patient lived and didn’t die from the treatment. The healing was gentle with no side affects or toxicity.
To answer the question again, the homeopathic remedy Cuprum metallicum, or any other other homeopathic remedy, is safe. You want to be respectful of the homeopathic remedies. Use them with good judgement. That is why it is good to see a professional homeopath.