vitamin D3
It depends on the source and how it's processed.
Caution
May cause symptoms in more sensitive people. Track your own reaction.
Vitamin D3 itself is not a histamine. Its suitability depends on the carrier (e.g., oil) in which it is supplied and on any other ingredients in the dietary supplement. In general, however, it is considered a stabilizer of mast cells, which release histamine into the body.