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One of the factors that the often aggressive marketers of liquid vitamins tend to quote, as a benefit of their products, is that the liquid vitamins are gentler on the stomach than the pill vitamins. This is an assertion that many people will not want to take at face value, instead preferring to interrogate it further. And it is that interrogation that leads us to the question as to whether the liquid vitamins are really gentler on the stomach than the pill vitamins. Now the one thing that both liquid vitamins and pill vitamins have in common is that they are taken orally. Once they are taken orally, both pass through the esophagus, and on to the stomach. The pill vitamins will tend to have a protective coating on them, which protects them from the acidic environment in the stomach (since the stomach, as we all know, is rather rich in hydrochloric acid). This protective coating sees them largely exempted from any processing in the stomach, so that they are passed on to the small intestine, from where they are directly absorbed into the bloodstream. The liquid vitamins, of course, don't come with any such protective covering. They are liquids that you gulp, pushing them down the mouth into the esophagus, and onto the stomach. At the stomach, they encounter the acidic environment. Inevitably, some of them end up being messed up here, but some - typically adequate amounts of them, survive the hostility of the stomach environment; to find their way to the small intestine, from where they are absorbed into the blood stream.
So, can we really say that the liquid vitamins are gentler on the stomach than the pill vitamins? Well, not exactly. But the issue of 'gentleness' to the stomach would not even arise with regard to substances like supplementary vitamins, as these are not the sorts of things that would ordinarily hurt the stomach in the first place. If anything, it is the stomach which has the potential to 'hurt' the liquid vitamins, seeing that (because of their lack of a protective covering), they have to put up with the hostility of the acidic environment that exists in the stomach. What is worth keeping in mind though, is the fact that in the case of pill vitamins, once the nutritional contents of the pill have been absorbed into the bloodstream, the body is left at a loss on what to do with the protective coverings. Out of necessity, these coverings are not made from digestible material, so the question of them being absorbed into the body does not arise. Ordinarily, these are the sorts of materials that are driven to the colon for elimination through the body by way of bowel movements. But there have been concerns that some of the materials used in making these protective coatings for pills can often be rather (or at least marginally) harmful materials. If some of them remain lodged in the body somehow, they would inevitably turn toxic with time. The beauty of liquid vitamins, of course, is that they don't leave you with protective coatings to deal with, and this is a great advantage to them, the fact that their being without such covering exposes them to considerable degradation in the stomach notwithstanding.
There are many different vitamins being sold to the general public that claim to be anti-aging. One true source of anti-aging is resveratrol, which comes from grapes!
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