Thank you for your enquiry Howard.
Multi-Xtra doesn't need to be enteric coated because it doesn't contain any of the additional ingredients we have in our Total Balance formula that need protection against stomach acid.
All the ingredients in Multi-Xtra are safe for the stomach itself to digest. Whereas in Total Balance we have additional ingredients that would be destroyed by stomach acid, and so the enteric coating protects these vulnerable ingredient, which then breaks down in the more alkaline environment of the small intestine, where they can be safely and fully absorbed, so that you lose no benefit.
Hope this helps!