No. The shellac, in the form used in Seeking Health supplements, is made by the insect Laccifer lacca. This is not to be confused with the varnish-like shellac which contains methanol (wood alcohol) and is very poisonous.
The shellac contained in Histamine Block is highly purified, food-grade, and natural. It is used as a stabilizer due to its high stability against UV radiation, and also provides enteric protection to prevent degradation of the DAO in the upper digestive tract.