They are not manufactured under the same controls, are not subject to regulatory inspection, and carry no assurance of identity, purity, peptide content, endotoxin level, or sterility
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Clinical Benefits: Regulates calcium and phosphate metabolism for bone and muscle health Supports immune system modulation and reduces susceptibility to infection Associated with improved mood and reduced risk of seasonal affective symptoms May help reduce systemic inflammation Supports neuromuscular function Effective for patients with malabsorption conditions or persistent oral supplementation failure A blood test can be arranged to confirm deficiency prior to treatment, though this is not always required
This is particularly interesting given that methionine restriction has been previously shown to improve metabolic outcomes as well as improve longevity in animal models 71,72,73
Physiol Plant 126:9096 Wang DH, Du F, Liu HY, Liang ZS (2010) Drought stress increases iridoid glycosides biosynthesis in the roots of Scrophularia ningpoensis seedlings
(Buy at DrHyman.com) One word of caution: Some people experience fatigue or rash when starting glutathione