I have over the past few years not only purchased vitamins (D/K) for myself and my family but also for my dogs (joint care). All are palatable (fussy dogs) and a family member who used to get cold sores has had none since taking the vitamins. I had recurring headaches and even these have decreased markedly. I did lots of research on the best Vit D and it was clear that the best was Vit D combined with Vit K. Troo prices are highly competitive and I continue to recommend this particular combination. Needed to speak to a customer service agent recently but there is no telephone which is a shame for people who do not have email access however that aside, I sent an email and the response was almost immediate. So very good customer care if you have internet facilities.