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Vegetable Glycerin studies
Glycerol is one of the most benign organic liquids known to man. It is hype-allergenic, non-carcinigeic, non teratogenic and non-mutagenic.
It is metabolized quite easily by a process called beta-oxidation.
This process results in the production of CO2 and H2O and is a quite normal, common, and natural catabolic process.
The following is a few excerpts from a study called SIDS initial assessment profile of Glycerol Citation
Glycerol is of low toxicity when injested, inhaled, or in contact with skin
The NOACE for local irritant effects to the upper respiratory tract is 165 mg/m3
Glycerol is of a low order of acute oral and dermal toxicity with LD50 values in excess of 4000 mg/kw bw.
Glycerol has low potential to irritate the skin and the eye
Glycerol is not a skin sensitiser
Glycerol does not induce gene mutations in bacterial strains, chromosomal effects in mammalian cells or primary DNA damage in vitro
Overall, glycerol is not considered to possess genotoxic potential
No effects on fertility and reproductive performance were observed
No further work is indicated by this study, because of the low hazard potential of this substance.
Izvor:
http://www.canadavapes.com/health/vegetable-glycerin-safety.html