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Nerve Growth Factor is commonly available as eyedrops and aids brain health, I know. I want to know what some negative effects of it are, and if I can take too much. I also want to know if it enhances the sense of touch if used topically (for example, one can feel things better if applied on fingers or can have better sex if applied on the labia/penis/whatever else). I also would like to know the implications of ingesting and injecting it. Any answers? I'm quite new to biohacking, so this is all quite confusing to me and I don't understand the technical writings about it.