I think the effects could have started to impact Olga's health in that in 1918 she's described as "skin and bones" I think it's pretty impressive when someone is thought thinner than TN .
However stress had to play a part...whether in advancing the effects of the poison or simply not eating due to stress . We know she received a number of shots in 1916 .
It's more likely caused by stress and insufficient diet, dear Annie.
Arsenic poisoning doesn't cause emaciation. According to a book, Napoleon Bonaparte wasn't reduced to skin and bones throughout the last years of his life.
(lol, clearly Napoleon had been 'well-provided' in exile)
Olga's cousin Alice, Alix's sister's Victoria's daughter ( and Prince Phillip's mother ) was given arsenic shots in 1912 as well for low sprints while nursing during a war in Greece...amazing they thought that would help! Perhaps to simulate the body to fight off the effects?? Hard to fathom
It helped. According to Wikipedia:
"In subtoxic doses, soluble arsenic compounds act as stimulants, and were once popular in small doses as medicine by people in the mid-18th century."
Perhaps the doses didn't accumulate so it hadn't become toxic (same with Olga's case).
However I found no proof it has been used in treating anemia :/