I used this a few years ago and just remembered it. I love the sour so so much. Just use it in filtered ice cold clean water or mix it to juices. What I find very special about this product is an uplift in mood and a general calmness. Absolutely recommending this.
I've been living in Colorado for 11 years and unable to hike in high altitudes in the mountains. I started taking this stuff in August (after being run down from a death in the family) and within a week I was able to walk, and even run, up hills that I could never walk up without stopping to rest. I'm also taking "NOW Ultra B-12", but I've taken that before without these amazing results. When I'm doing lots of yard work or a strenuous project, I take the Royal Camu with a bit of raw honey every hour and wow, I feel great all day.