Rasika, beef jerky or any other dehydrated meat for that matter is fine for as long as it is made as it was originally made. That does not mean the addition of two chemicals that I would never put into my body namely: MSG and Sodium Nitrite.
Not all your manufacturers are created equal Rasika. Some pride themselves on quality which to them means going back to manufacturing a product that is as close to the original as possible, whilst others simply add preservatives and flavour enhancers as the two I've mentioned above because well...they can!
As far as protein is concerned, it's great. However be aware of different packaging and that the addition of black peppered beef jerky tends to puncture bags easier than most other flavoured jerkies.
Fadi.