A distinction needs to be made between quickly obtaining an issued patent versus quickly filing a patent application. The kind of protection offered by an issued patent is different from a pending patent application
An expired patent does not give one the right to file a patent application that is identical to the expired patent.
A design patent must be new and not obvious in order to be valid. This is the same for utility patents.
Quick ways for patent protection can include a provisional patent application and/or design application.
Design infringement occurs when the allegedly infringing device is substantially the same as the design patent, when viewed by an ordinary observer. Unfortunately, the infringement test is not based on an amount of difference (e.g., slight).
design patent covers the overall shape of something. If your vitamin is in the shape of a brownie, a design patent might be possible
design patent must be new and not obvious in view of prior designs