Clay is used to take a mold of a good tab. This good tab mold is fit to the broken tab, then filled with ABS cement. The tab is rough, and not exactly perfect. However, it is a full plastic repair of the missing section, and a great improvement over what was there.
The real reason we are feeling so run down is lack of nutrients in our soils. Even eating exceptionally well, we will still run short. Its a sad fact, but true. To cover those daily needs the best nutritionals out there can be found at http://healthforthesoul.youngevity.com/ My recommendation is the healthy start pack for your basics.
Dehydration is a Possibility. You might also feel nauseous during or after a run because you're dehydrated. Nausea is an early symptom of dehydration . The current recommendations for hydrating while running is to obey your thirst and drink when your mouth is dry and you're feeling thirsty.