First of all, the cinnabar bracelet belongs to buddhist supplies, which has the function of exorcising evil spirits and opening light in Buddhism, so the cinnabar bracelet posted on the temple may be true.
Secondly, the main component of cinnabar is mercury sulfide. If worn for a long time, it may lead to mercury poisoning. Therefore, when wearing a cinnabar bracelet, you need to be careful not to wear it for a long time, not to wear it next to your body, and not to let the cinnabar bracelet touch the heat source.
Finally, some unscrupulous merchants may make fake cinnabar bracelets for sale for profit. Therefore, when buying cinnabar bracelets, you need to choose regular merchants and pay attention to distinguish the authenticity of bracelets.
To sum up, the cinnabar bracelet attached to the temple may be real, but you need to pay attention to some matters when wearing it. If you have doubts about the authenticity of cinnabar bracelets, it is recommended to go to the temple for consultation and identification.