I have been on Health Unlocked for Thyroid Condition. I have been told by a benign Pharmacist years ago that as dosage of levothyroxine is the main thing the brand did not matter. However whatever you get will never work how your body would, so the thing is to get brand that does the least damage in how Human you feel. Added to which I also take adrenal replacement steroids. They also do not "talk" to your body because of entry through the digestive system & not getting natural instructions from the Hypothalamus/Pituitary/ Thyroid glands needing fully functioning adrenaline. (I had low because I stopped making mine after having wrong diagnosis for Asthma.) Never got better, inflammation severe took on board more steroids to subdue this, So when I got Generic Brand of Levothyroxine & saw on packet New Formulation I wondered how & why? Well It has another ingredient in along with usual fillers Maltodextrine which as we all know is a sugar derivative. I have felt worse & mainly because I take Adrenal replacement Hydrocortisone. The addition Teva has made makes me think they are trying to speed up the take up of their Thyroxine. OK if patient only on Thyroxine replacement pehaps but I don't think its so in my case. If you look on patient Information on both drugs I take It says to talk with Specialist 1st. Never had that luxury as decisions through circumstances taken out of my hands. Sorry about long e-mail. But all I have said should be strongly considered. So I would repeat one Thing New Formulation of Teva Levothyroxine.