Love this product! Gaia Herbs has the best Spirulina Product I have ever taken. Quality of the product is evident in the smell, coloring & how quickly it actually takes effect. Very important to gradually work up to the 4 tabs per day due to the temporary effects of the detoxification process. After being on the 4 tabs per day for a few months now, I now have sustained energy & mental alertness throughout the day, even with my busy schedule. I now split the 4 tabs up 2x/day & take them no later than 2 or 3 PM to prevent interfering with sleep.