Camellia oil is different from different suppliers. Some suppliers advertise their camellia oil is high oleic - 79% or higher - and some advertise it is well balanced between oleic and linoleic fatty acids - 42% and 36% respectively. This will affect the shelf life of your oil - between 18 to 24 months - so ask your supplier which oil you are purchasing from them. I am going to work with the figures from my supplier, which is a high oleic version.
Camellia oil contains 8% palmitic acid (C16), 2% stearic acid (C18), 79% oleic acid (C18:1), and 7% linoleic acid (C18:2). The oleic acid contained in camellia oil is as high or higher than olive oil (up to 83%) and avocado oil (up to 80%) without being as heavy an oil as those others. Camellia oil offers all the great stuff we want from oleic acid - it is well absorbed by the skin, offering softening, moisturizing, and regenerating properties, and it offers anti-inflammatory benefits. Considering using it where you use olive oil but want a lighter lotion or product!
Camellia oil contains a lot of polyphenols in the form of tannins and catechins. The catechins offer antibiotic properties and research into green tea polyphenols is showing some promise in preventing UV related skin damage (although preliminary studies show that camellia oil doesn't seem to have a suppressive effect on skin cancer induced on mice). The tannins in camellia oil make it an astringent oil with a dry feel, so it's good for hair care products or other creations where you want a light, dry feel.
Although camellia sinensis contains caffeine, it's a water soluble alkaloid we don't find in the oil. We do, however, find it in green tea extract (more about this amazingly cool extract in a while!)
You'll want to use camellia oil at up to 10% in your creations. You can use it at higher levels, even neat on your nails and hair, but this will impart a drier feeling to your products. It has a 12 to 24 month shelf life - check with your supplier - if you keep it in a cool, dark place. It is absorbed well by your skin, is non-tacky, and is a good addition to a massage oil. I like it in manicure and hair care products.
I have to admit, I found researching this oil really frustrating. Everyone is passing on the same information as if it were gospel - it's high in Vitamin E and phytosterols - with no numbers or studies cited. Stated that it has been used in Asia for centuries - Japanese people have been using this oil for centuries, Sumo wrestlers use it on their hair, the most beautiful women in China use it - means nothing. The touch of a monarch was thought to cure scrofula - but then again, have you ever met anyone diagnosed with this? So it must work!
Camellia oil WILL NOT make your hair or nails grow faster. No oils can do this. It can, however, make your nails and hair feel very nice!