Sodium borate, or borax, appears in cleaning products, pesticides, and industrial processes. No recognized health authority, including the FDA and NIH, considers it a safe dietary supplement.
People sometimes promote borax for joint comfort, mineral balance, or hormone support. These claims are both unproven and dangerous. No evidence shows any benefit, and swallowing borax can cause acute poisoning, kidney damage, and death.
Borax is toxic when ingested. The EPA and NIH label it as hazardous. No safe oral dose for humans has been established. Do not use it as a supplement.