Boots Value Health Glycerin BP
Many DIY Mixers use Boots Glycerin and have questioned it's origins. Boots had this to say about it's product:
Thank you for your email regarding Boots Value Health BP item code 2304570.
From the data we hold on file, I can confirm that it is 100% glycerin sourced from rapeseed, coconut, palm kernels or palm oils. The product does not contain any animal ingredients.
I hope that this information proves useful to you and once again thank you for taking the time to contact Boots.
Information from this link.