What is the difference between novolog 70/30 and novolin (insulin)?

Big difference. Novolin has become synonimus with nph novolin insulin, though novolin is just a brand name, you also have novolin regular Insulin or novolin-r, so you have to be careful. Novolog 70 /30 is a combination of 70% nph and 30% NovoLog (fast acting insulin) therefore the action of both insulins is very different.

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What is the main difference between novolog 70/30 and novolin (insulin)?

Novolog is faster. The '70' portion of both is same, but the '30' portion of NovoLog has faster onset of action <15 min vs about 30 min for novolin (insulin). Otherwise, unit for unit they are about same. The NovoLog thus can be used right before meal, novolin (insulin) should be about 15-30 min before meal. So just timing is different. Consult doc. Good luck. Read more...