The advice is cautious and sensible rather than absolute
Tobin, W
Experts don't know if taking glutathione is safe during pregnancy and while breastfeeding
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296 Vaccines, such as BNT162b2 and mRNA-1273, have been developed based on mRNA LNP technology against COVID-19, which demonstrate the feasibility of LNPs in delivering mRNA encoding the spike protein of syndrome coronavirus 2 (SARS-CoV-2), thus eliciting an immune response against the virus
Fenn K, Strandwitz P, Stewart EJ, Dimise E, Rubin S, Gurubacharya S, et al