I had a bottle from www.majorsurplusnsurvival.com @ 12 tabs a day you have 15 days of supply and a useable water container to wash the things down. They cost $25+ s/h. The taste isn't bad at all- except the taste you get after buying something that doesn't quite measure up. The tabs provide the RDA vitamens and minerals. I lasted 4 days on a tab and water diet. I don't know how rapidly the body exausts specific vitamens and minerals or the immediate effects on the average metabolism. I was plenty grumpy in spite of my B12 <img src="/images/graemlins/grin.gif" alt="" /> I guess I was supposed to be trapping rabbits with my snare wire, stewing up grubs and dandelions and catching Coho Salmon with my PSK fishing kit. My view is these tabs are the philosophical equal of the space blanket. For $25 buy some dehydrated or long term foodstuffs.