iOS ipa file size increases a LOT when using native calls

Hi. I have this project that when i remove all native iOS calls (aka plugins) and build, the final ipa size gets as low as 12MB (usign Strip ByteCode setting). But when i build it using just one simple call to native code, the file size goes to as high as 55MB! that's a huge difference for something so simple! Any idea why this might be happening? is this normal behaviour? is there any solution to it? I will really appreciate any information! Thanks!