In this context, shilajit seems to be a powerful antioxidant phytocomplex. Recent studies on the composition of Andean Shilajit in Chile have evidenced an ORAC index between 50 and 500 Trolox units/g of material, which is substantially higher than Noni and blueberries (Quinteros et al., unpublished data). It is likely that the curative properties attributable to shilajit are provided by the significant levels of fulvic acids that shilajit contains, considering that fulvic acid is known by its strong antioxidant actions and likely has systemic effects as complement activator. Fulvic acid is soluble in water under different pH conditions, and because of its low molecular weight (around 2 kDa), it is well absorbed in the intestinal tract and eliminated within hours from the body. Humic acid is soluble in water under alkaline conditions and has a molecular weight of 5–10 kDa. Humins are not soluble in water under any pH condition. Components are divided operationally in humins, humic acid, and fulvic acids according to their solubility in water at different pH levels. The humic substances are the results of degradation of organic matter, mainly vegetal substances, which is the result of the action of many microorganisms. Shilajit is composed mainly of humic substances, including fulvic acid, that account for around 60% to 80% of the total nutraceutical compound plus some oligoelements including selenium of antiaging properties ( Figure 1). Considering the expected impact of shilajit usage in the medical field, especially in the neurological sciences, more investigations at the basic biological level as well as clinical trials are necessary, in order to understand how organic molecules of shilajit and particularly fulvic acid, one of the active principles, and oligoelements act at both the molecular and cellular levels and in the whole organism. In essence, this is a nutraceutical product of demonstrated benefits for human health. Thus, fulvic acid, the main active principle, blocks tau self-aggregation, opening an avenue toward the study of Alzheimer's therapy. Recent investigations point to an interesting medical application toward the control of cognitive disorders associated with aging, and cognitive stimulation. It is a potent and very safe dietary supplement, restoring the energetic balance and potentially able to prevent several diseases. Shilajit is a natural substance found mainly in the Himalayas, formed for centuries by the gradual decomposition of certain plants by the action of microorganisms.
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