Thanks for the suggestion! Right now I'm trying to see what I can do with food rather than supplements. I found a website that lists food sources of biotin and which recommends taking it in food form, so maybe I'll make a concerted effort to increase my biotin. Of course the very foods I dropped have biotin: almonds and cashews! (25 mcg daily is recommended for my gender and age). The list is below and the page is
http://www.feinberg.northwestern.edu/nutrition/factsheets/biotin.html

Peanuts, 1/2 cup: 73
Filberts, 1/2 cup: 51
Almonds, 1/2 cup: 34
Peanut butter, 2 Tbl: 32
Soy protein isolate, 1 oz: 8.5
Egg, 1 large cooked: 8.1
Cashews, 1/2 cup: 8.9
Low fat yogurt, 1 cup: 7.4
Haddock, 3.5 oz cooked: 6.0
Sweet potatoes, canned, 1/2 cup: 5.5
Swiss chard, cooked, 1/2 cup: 5.3
Salmon, 3.5 oz cooked: 5.0
Nonfat milk, 1 cup: 4.9
Tomato sauce, 1/2 cup: 4.7
Carrots, 1/2 cup, cooked: 3.9
Avocado, half: 3.6
Carrot, 7.5" raw: 3.6
Papaya cubes, 1 cup: 3.1
Banana, one: 3.1
Pork, 3.5 oz cooked: 3.0
Tuna, 3.5 oz canned: 3.0