cant offer any helpful suggestions, but the nerd in me is screaming out to type that VG is used as an antifreeze by some, folk who want to store and preserve live yeast cultures can do so in a VG suspension in the freeer (generally a bit colder than domestic freezers tho..)
this is a copy paste from :
link ...i will short a bit : What are the differences between Crude Glycerin,
Technical Grade Glycerin, and 99.7 - USP Grade
Glycerin? .....
Crude Glycerin - Crude glycerin contains a significant
amount of methanol, water, soaps, and salts and
typically has a glycerol content of anywhere between
40 to 88%. Crude glycerol is a natural by-product
produced during the biodiesel production process,
specifically taking place during transesterification.
Technical Grade Glycerin - Technical grade glycerin
is a refined, high-purity product that is water white with
most of its contaminants completely removed.
Technical grade glycerin contains no methanol, soaps,
salts, and other foreign matter. Biodiesel plants
purchased from SRS Engineering, unlike many of our
competitor's plants, produce technical grade glycerin
right from the start.
USP Grade Glycerin - USP Grade Glycerin is a pharmaceutical grade glycerin suitable for food,
personal care, cosmetics, pharmaceuticals, and other specialty applications. All of these products
have met the US Pharmacopeia specifications (USP 30).
.....
more details : 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.
Glycerol is of low toxicity when ingested, 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 irritant
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.
Vegetable Glycerin Allergies & Side effects
Allergies
The risk of being allergic to vegetable glycerin is very low. The only population which may experience problems with metabolism of Glycerol would be diabetics owing to the anabolic hepatic pathway which can convert free Glycerol to glucose(but this would still not be an issue at the levels used in vaping).
Side Effects
The most common noted side effect of inhalation of e-liquid containing vegetable glycerin is a dry mouth, sore throat, and increased thirst. These symptoms usually last just a few days to a week as the body gets used to the vegetable glycerin. These symptoms can be lessened by drinking more water and liquids then usual for the first few weeks of using your e-cigarette.
If you are moving from smoking traditional cigarettes to e-cigarettes, you will find there are many side effects of quitting smoking tobacco products. It is very easy for a new user of an e-cigarette to incorrectly attribute these quitting smoking side effects to the e-cigarette, when in fact they are likely the result of your bodies reaction to quitting smoking tobacco cigarettes. Side effects of quitting smoking include: Bad breath, stomach pain, nausea, constipation, increased appetite, skin breakout’s, increased coughing, insomnia, depression, vagueness, irritability, gas, dry throat, nasal drip, dizziness, vertigo. Many of these side effects of quitting smoking will be alleviated by using the e-cigarette. ..... 2nd part is an article which i copy from here
link
a review to read here
linkwikipedia here
link.....
