According to Japan's Ministry of Health, Labor and Welfare [1] it's a "substance that reacts to magnets", which "could be metal". Unfortunately, metallic contaminants have been found in many vaccines, so this would not…
According to Japan's Ministry of Health, Labor and Welfare [1] it's a "substance that reacts to magnets", which "could be metal". Unfortunately, metallic contaminants have been found in many vaccines, so this would not…