Good quality pure vitamin C. I also like that there is nothing in the capsule except for Scottish ascorbic acid. Since taking these I do seem to have a stronger immune system, as I haven’t had a sniffle or even a hint of a cough, despite being out daily in all weathers. Happy with the quality and purity of this supplement. A bit pricier than others, but it has a unique selling point and you are contributing to helping keep a unique Scottish facility going.