The Corpse Vanishes (1942)

[GenreOnline.net]

aka: The Case of the Missing Brides

A scientist, aided by an old hag and her two sons, kills virginal brides, steals their bodies, and extracts gland fluid to keep his ancient wife alive and young.

Alternate link in case of a takedown by YouTube:
https://rumble.com/v2saj4w-the-corpse-vanishes-1942.-public-domain-data-with-reference-links-for-verif.html