For those who put together their own version of a B-Complex, do you have any recommendations for starting places for brands and doses? I'm planning to try the NatureMade B-Complex with C (per one capsule): 15mg B1 (as Thiamin Mononitrate) 10.2mg B2 (Riboflavin) 50mg B3 (Niacin as Niacinamide) 5mg B6 (as Pyriodoxine Hydrochloride) 10mg Pantothenic Acid (as d-Calcium Pantothenate) And, if I understand correctly, it's missing biotin and p-5-p (anything else?). Does brand on either of those matter? And are there any suggestions on how to go about dosing? Thanks!