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Amethyst is a very powerful and protective crystal, and is a first choice of many metaphysicians. Amethyst was used in ancient times to recover from both physical addictions as well as addictive relationships, and became known as the “Stone of Sobriety”. A natural stress reliever, Amethyst can encourage inner strength.
Physically, Amethyst can help to alleviate headaches and migraines. It dispels nightmares and helps with insomnia. Amethyst can also reduce eyestrain, especially when working at a computer. (source.)