Claims of large scale German production of human soap from human corpses were made during WWII and the postwar period, but have been abandoned. Similar claims were made during WWI.
During the WWII and in the postwar period, there were allegation of fabrication of human soap at the Belzec camp. One notable propagator of this was Simon Wiesenthal. Boxes with soap for the Waffen-SS were labelled with RIF, which supposedly meant "Rein jüdisches Fett’ ("Pure Jewish Fat"). In reality, the acronym RIF meant “Reichsstelle für industrielle Fettversorgung” ("National office for industrial fat supply") and had nothing to do with human fat, much less Jewish fat, as was also admitted by the Jewish historian Yehuda Bauer in 1991.
Despite many of the early claims having been admitted to be false, there are sometimes still claims of experimental/small scale production, such as at or near the Stutthof camp.
Revisionists argue that typical "witness" claims of how the fat was obtained state that fat was liquified due to heat, when corpses were being burned at high temperatures and the liquid fat was then collected. This is argued to be physically impossible, since if anything burns easily in a corpse it is the fat, and the fat at such temperatures would inevitable have started burning.
- Western Holocaust camps - on allegations of use of other human remains such as shrunken human heads and human skin artifacts at the Buchenwald and Dachau camps.
- Lectures on the Holocaust - section 2.7. "Jewish Soap, Lampshades, and Shrunken Heads"
- Belzec—in Propaganda, Testimonies, Archeological Research, and History - section 1.4. "The “Soap Factory Using Human Fat” at Belzec"
- Belzec—in Propaganda, Testimonies, Archeological Research, and History http://holocausthandbooks.com/index.php?page_id=9
- Holocaust Handbooks, Volume 15: Germar Rudolf: Lectures on the Holocaust—Controversial Issues Cross Examined 2nd, revised and corrected edition. http://holocausthandbooks.com/index.php?page_id=15