An evaluation on Liquid vitamins and minerals was reported in 1998 in the Journal of Medicinal foods. The evidence around whether or not there were benefits to liquid vitamins and minerals was the purpose of the evaluation.
From the wide variety of research studies that were reviewed, it was determined that liquid supplements contain nutrients that can be gentler to the stomach, highly bioavailable and sometimes more suitable for elderly people and children. More info about this research can be found in the Journal of Medicinal Food, Volume 2, number 3 page 207
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Research in the year 2000 was conducted to study the effect of multivitamin and mineral supplements in older people who are already consuming a nutrient-fortified diet. A placebo controlled trial was conducted on 80 adults between the ages of 50 to 87. The study’s objective was whether a daily mineral/multivitamin supplement could improve the blood’s antioxidant capacity and the body’s micro-nutrient status.
Researchers concluded that supplementation with a multi-vitamin at around 100% daily value, can improve older people’s micro-nutrient status and can increase the vitamin status to levels associated with reduced risk for several chronic diseases. There are more details on this research in the “Journal of the American College of Nutrition”, Vol 19, 2000.