Sterility is another issue since many take BPC-157 by injection, any contamination in the preparation could cause infections or other reactions
Salinthone S, Yadav V, Bourdette DN, Carr DW
Visible changes in brightness and evenness of skin tone may take several weeks to months, depending on baseline pigmentation, dose, route of administration, and adherence to sun protection. Results are often subtle and natural-looking, and ongoing maintenance may be required to sustain benefits, especially in individuals with high sun exposure
References: Witschi A, Reddy S, Stofer B, Lauterburg BH
Scientists often measure the ratio of GSH to GSSG when studying oxidative stress
Intravenous administration might be effective since it bypasses the gastrointestinal tract, immediately enters the blood stream, and presumably would saturate body tissues such as the lungs