Have Jehovah’s Witnesses historically believed that they should read food labels to search for blood products?
YES – The Watchtower 9/15/1961 p. 557 par. 14 – Respect for the Sanctity of Blood
various tonics and tablets show on their labels that they contain blood fractions such as hemoglobin. So it is necessary to be alert, to be acquainted with the practices in his community, to make reasonable inquiry at places where he buys meat and to read and understand the labels on packaged goods.
NO – The Watchtower 10/15/92 p. 31 – Questions From Readers
It is not as if every Christian worldwide must study the labels and ingredients on all packaged food or should interrogate employees at restaurants or food stores.