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On a standard U-100 insulin syringe, 1 mL equals 100 units

Any oral supplement must be ingested and absorbed through your digestive tract

Brown urine Medicines that turn urine brown include: antipsychotic drugs, such as chlorpromazine and thioridazine antibiotics, such as metronidazole and nitrofurantoin phenytoin, or Dilantin, an epilepsy drug sennoside laxatives, such as Senna-Lax and Senokot Deep purple urine A condition called porphyria causes urine to appear deep purple

This is another natural form of B12, but unlike all the other options we have just explored, it is only available on prescription and given as an injection