The Retrospect of Practical Medicine and Surgery, a medical text published in 1856, recommends charcoal biscuits for gastric problems, saying each biscuit contained ten grains (648 mg) of charcoal.
In the Retrospect of Practical Medicine and Surgery, published in 1856, it is suggested to utilize charcoal biscuits for stomach problems. The text specifies that each biscuit contains ten grains (648 mg) of charcoal.