★★★★★
As Paracelsus, a famous medievil Swiss physician said: "Poison is in everything, and no thing is without poison. The dosage makes it either a poison or a remedy."
For a reasonable account of warnings and contraindications for BS, see this link.
For further evidence of the usefulness of BS to the body (other than just for alkalizing) see this link.
I've been using SB against candida in high dosages and on a regular basis since then for many years and have noticed no adverse effects.