-- After several surgeries, nutrients have been very hard for my gut to absorb. My blood panels consistently showed low-levels of many, including vitamins A, D, E, B1, B6 and B12. The same for calcium, magnesium and essential minerals. My energy level was also low. I eat well (no junk) and walk on a daily basis, albeit using forearm crutches. I am a 64 year-old male with a 'past' history of Hypertension and type 2 diabetes. At a consult with a physician-referred nutritionist, I was told I could buy several different supplements at a cost of over $200. per month, or I could try these. After two weeks, I noticed an uptake in energy, better sleep and a reduction in brain fog (if you have it, you'll understand). Six weeks in, my blood work shows zero vitamin deficiencies. I take a packet each morning with a sensible breakfast. No unpleasant after effects is a real plus. Animal Pak is not a magic bullet or the Holy Grail.. you've got to take care of yourself to begin with. (If you smoke, Stop!!) I am more than satisfied and will continue on with this product in my daily regimen. I have no affiliation with the company, nor is this a paid endorsement. My take -- Try it for a month