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These toxins must be converted to water-soluble substances for easy excretion

When you take pills or liquids by mouth, they have to battle through your digestive system, where typically only 15-20% of the good stuff actually makes it into your bloodstream and that's assuming your digestive system is working perfectly, which often isn't the case when you're sick

[15] The last of the 20 common amino acids to be discovered was threonine in 1935 by William Cumming Rose, who also determined the essential amino acids and established the minimum daily requirements of all amino acids for optimal growth

et al (2019) Medical and Dietary Uses of N-Acetylcysteine

J., Yang, Y

B-Vitamin energy blend: Each serving delivers vitamin B1, vitamin B12 and vitamin B5, nutrients that help support the body's normal energy metabolism