Here's an email I received from Lender's Bagels. The bagels contain an ingredient derived from CHICKEN FEATHERS (?!?! eww..! who'd a thought?!) However, I haven't found information that would deem them as haram as the laws for zabiha meat and zabiha animal hide/exterior are different. I guess it just makes the bagels weird for now, until I find more info.
In the baking process yeast converts sugar into carbon dioxide and allows baked products to rise. HFCS is the sugar source in Lender's bagels that facilitates that process.
The dough conditioner in bagels, l-cycsteine is sourced from chicken - chicken feathers to be exact. This might render the bagels unacceptable for vegetarian consumption.
Beyond those requirements, the details of individual ingredients are part of our confidential formulation which we are not able to disclose.
Thank you for your e-mail.
Consumer Insights Representative