A magnet or something magnetic is neither harmful nor beneficial to the human body. To the current common magnet bracelet, for example, to introduce the following knowledge to you: medical equipment in the nuclear magnetic, high magnetic field of more than 3T, no harm to the human body. It is recognized that in all radiology medical equipment, nuclear magnetic is the safest. In other words, people are not afraid of magnetic fields, but more afraid of rays. It is true that high magnetic fields have some negative effects on the human body, but the limited amount of magnets in magnet bracelets is not likely to have any effect on the human body at all. Some people claim that magnets provide the magnetic force to change physiological organization, and even believe that every cell has positive and negative poles, while others claim that magnets can enhance the circulation of blood. In fact, there is no evidence that human tissue cells or blood and magnetic fields have any interaction, the iron ions in red blood cells, not only no ferromagnetism, or even anti-magnetic, will not be attracted by the magnetic field, it is well known that hot packs will promote blood circulation, the result is that the skin will become red, if the magnet can really promote the circulation of the blood, why is there no reddening of the skin with direct contact with the magnet?
The effect of magnet therapy is only the so-called psychological implication ability, and does not have a very direct and obvious medical effect. Magnet bracelets through the weak magnetic lines of force constantly stimulate the wrist microcirculation system, to promote blood circulation, improve the human physiological magnetic field, eliminate fatigue has a very weak efficacy, it is true that there is a certain benefit to sleep, but not great. Long-term wear magnet bracelet does not have any damage to the human body.
Magnets are objects that can produce a magnetic field for a magnetic dipole, able to attract ferromagnetic substances such as iron, nickel, cobalt and other metals. Magnetic poles are determined by hanging a magnet by a thin wire, and the pole pointing north is called the north pole or N pole, and the pole pointing south is the south pole or S pole. (If you think of the Earth as a large magnet, the Earth's geomagnetic north pole is currently the S pole and the geomagnetic south pole is the N pole.) Magnets attract when they have opposite poles and repel when they have the same pole. The north pole attracts to the north pole of the finger, the south pole repels to the south pole of the finger, and the north pole repels to the north pole of the finger.
Magnets can be categorized as "permanent" or "non-permanent". Permanent magnets can be natural products, also known as natural magnets, or they can be man-made (the strongest magnets are neodymium-iron-boron magnets). Non-permanent magnets, such as electromagnets, become magnetic only under certain conditions.
A magnet is a substance that can attract or repel each other; if all the tiny molecules inside say an object can be aligned in the same direction, it becomes a magnet. Components are iron, cobalt, nickel and other special atomic structure, the atoms themselves have a magnetic moment, the general molecular arrangement of these minerals is chaotic. Magnetic areas affect each other will not show magnetic, but in the external force (such as magnetic field) guide molecular arrangement tends to the same direction, it will show magnetic, which is commonly known as a magnet. Iron, cobalt, nickel, is the most commonly used magnetic substances, basically the magnet is divided into permanent magnets and soft iron, permanent magnets are coupled with strong magnetism, so that the spin of the magnetic material and the electron angular momentum into a fixed direction of the arrangement of soft magnetic is coupled with the electric current (is also a method of adding magnetism) and so the current is removed from the soft iron will slowly lose its magnetism.