How much 3% H2O2 solution is dangerous?

[hauss]

What are some different quantities and their related effects on humans?

[Rabid_Squirrel]

Not sure if this is what you're after, but here's (http://www.med-chem.com/MSDS/H2O2_msds.htm) the material saftey data sheet for 3% hydrogen peroxide.

Basically, the only health hazards are from long-term skin contact and digestion.

[Rabid_Squirrel]

Just found another source, here (http://avogadro.chem.iastate.edu/MSDS/H2O2_3pct.htm). The lethal dose for 50% of the population (LD50, for those playing at home) as tested on rats is between 370-1500mg per kg of bodymass, while it's 3-4g/kg on skin.

An extremely rough estimate (the LD50 trial for lab rats don't scale well, so don't expect these figures to be accurate) for a 75kg human would be ~28-113grams orally and 225-300 grams via skin contact.

[scm1001]

in practice 3% is quite mild and pretty safe. It will bleach your outer skin layer white if left too long and I wouldn't recommend drinking it, but I had a friend who used to gargle with it (bad breathe). Probably quite irritating to the eyes.