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Nielson GL, Sorensen HT, et al

Like most naturally occurring chemicals, there are different formations of the same chemicals

J Neurosci 27:91929200 Tani H, Dulla CG, Farzampour Z, Taylor-Weiner A, Huguenard JR, Reimer RJ (2014) A local glutamate-glutamine cycle sustains synaptic excitatory transmitter release

PLoS One 6:e16360 Dixon D, Cole DJ, Edwards R (1997) Characterisation of multiple glutathione transferases containing the GST I subunit with activities toward herbicide substrates in maize ( Zea mays )

Even a Vitamin C serum with a lower concentration of 2-5% can deliver benefits for your skin, including brightening and antioxidant protection against environmental damage