The RC extract I'm on is from iHerb, Natures Answer is the brand. Ingredients are nothing but RC aerial parts, vegetable glycerin and purified water. Concentration is quite high, its 2000mg/2ml. Costs about 23€ for 30ml bottle which on my rather high dosage of 40 drops per day, lasts exactly one month. Its great, doesn't irritate even the most sensitive skin and I can tell its working. iHerb does ship to entire EU without problems, UK as well, so anybody ordering from around here can get it.