I've been doing a lot of worldbuilding/planning around the Claret Orders for a fic, and one of the issues is how they would have dealt with anemic trainees and blood hunters.
Obviously, there would be clerics and other magical healers in the Orders, particularly because they were founded with a pact with the Raven Queen. However, healers can't be throwing around spells just to compensate for 1-2 rites per person every day when they've likely also got to deal with diseases (particularly blood-related ones) and typical burdens of treating soldiers.
Anemia is the loss of red blood cells, which is a problem given that they carry oxygen through the body. Iron is necessary to replace these lost cells. Iron can be difficult to supplement in a medieval diet, though we can take some liberties given that Exandria is post-apocalyptic and there doesn't need to be exclusivity regarding crops in any particular region (as long as the climate won't kill them). Generally, heme iron (from animals) is better than non-heme iron (other sources, which is less likely to be absorbed through digestion), though any iron is better than none.
One classic way to supplement iron in your diet, regardless of the food available, is to cook with cast iron tools. Minute amounts of non-heme iron are added to food while cooking, but it's enough to make an impact if done consistently. Cooking with acidic ingredients increases the likelihood that iron from the cooking implements will be released into the food.
Wine is acidic.
The Claret Orders could supplement cooked meals at their headquarters and camps by using iron cooking pots/pans/cauldrons and adding wine as the meal cooks. Other alcohols, such as whiskey, could also work.
Sure sounds like a good explanation for the Tombtakers' "Muster" in episode 122.
