One is yellow, other grey or black, that's all difference. Color of cap is absolutely nothing, as ashop said. Best choice is pharma Gh or high quality generic from reliable source. Speaking of Chinese generic gh you must be ready to everything, for example, one batch could have 10 ius while another batch from the same source 12 ius sometimes 0 iu, it's like a gambling game. I'm not saying you can't find good chinese generic source, but it's pretty rare

It means it's all generic Chinese crap and you have a slim chance of getting semi respectable hgh if you're lucky.

The color of cap means absolutely nothing.

This makes me laugh a bit. Sorry, not at you but how people dont understand that color-tops-don't-mean-shit! Lol.
Stop using generics and go with pharmacy grade. JS

The color doesn't matter but the potency of the product does. do blood work and you'll see which is better or check if they have lab results to support the product. hope this helps

Color doesn't matter igf1 test dose

Blood serum test is always a good idea. Fairly cheap to.

Remember no source or brand names in the forums. It's not the place for it.

Some suppliers its the same but with others they're dosed differently. The key is the price, if a 100iu yellow top cost more but is the same brand usually means it's dosed higher and has less impurities than a 100iu black top kit of the same brand that cost less. Recently found this to be true of angtropin yellow top versus gray top, supplier could not price match 200 iu worth of yellow top st gray top price because it was dosed higher. Be careful though some brands do not come in anything but yellow black gray and you could have a fake, hygetropin has been known to be bunk the most with black tops I think.