Anzen pain relief products are safer than competing pain relief medications. Many products contain over the counter pain relief ingredients. Headache medication, seasonal cold and flu products, allergy relief, sleep aids, and joint pain products are only a few. Some people may take more than one pain reliever at a time without realizing the risks. An overdose of pain relief drugs can occur unintentionally. Anzen pain relief products include specially designed ingredients to avoid the harmful effects of an accidental large dose.