updated 04/19/2013 Overhauled.
I have a more recent post detailing what I have learned about diketones here.
The natural problem I ran into when I first started DIY is that some manufacturers only list they are Diacetyl-free. The 3 alpha-diketones of present concern are primarily used for flavors that include custards, creams, cakes, cookies, and butters. The following is a summary of information I had collected from flavoring manufacturers concerning these.
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Capella Flavor Drops: Website states Diacetyl-free. For over 9 months I emailed them requesting if their products use Acetyl Propionyl or Acetoin. They did not respond to any of them. Customer service non-existent.
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Flavor West: Website states Diacetyl-free. I received a email response advising they do not add Acetyl Propionyl or Acetoin to their flavorings.
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Flavour Art: Website has a separate category for Electronic Cigarettes. Per a ticket response all flavorings under that category have been reformulated to be free of Diacetyl and related butter-like diketones. If your purchasing from a distributor you may want to verify they are purchasing from the Electronic Cigarette list of flavorings as some of their similar flavorings in the Kitchen category may still contain Diacetyl.
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LorAnn Oils: Website states Diacetyl-free. Email response stated they do use Acetyl Propionyl and Acetoin in some products, yet, did not state which.
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The Perfumer's Apprentice (a.k.a The Flavor Apprentice or Signature): Website advises if Acetyl Propionyl or Acetoin are present in each flavor's individual product page. TPA refers to them as "custard notes." Great email communication on other unrelated concerns.
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flavorconcentrates.com: Website states Diacetyl-free. I received a email response advising they do not add Acetyl Propionyl or Acetoin to their flavorings.
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Nature's Flavors: Website is a little confusing in such a way that it appears they may still use Diacetyl in some flavorings. I attempted to contact them once and never received a response. I might attempt it again soon.
There are some new manufacturers I have not investigated yet.
Most vaper-specific websites that sell DIY flavorings are obtaining them from separate manufacturers. They can offer discounted pricing on the smaller bottles by buying in larger volumes and re-bottling them.
Thanks for this, I tend to only use Capella's as I like their flavours most of all (generally). I have actually emailed them and asked them again, with a link to this thread, as I think it is important we know what is in our flavorings and if anything is possibly hazardous we have the option to not use it.
I'm ignorant and not sure what you mean with regard to the perfumer's apprentice. Does that mean their flavors are generally good to go?
Flavor West This should be the corrected link to Flavor West
Maybe flavourart changed their site since this thread was created, but I can't find any info on the site about which flavours carry diketones.
All I can find is a general info article about diacetyl and it's safety to ingest vs unsafety to inhale for large quantities over a period of time.
I'll have to look into it later. I should update this a bit anyway as I've learned a lot since I wrote it.
I would appreciate if you did. I'm still learning a lot of this stuff, and some things are kind of scary. Thanks in advance.