Lyophilized simply means the peptide has been freeze-dried
Elbialy ZI, Salah AS, Elsheshtawy A, Rizk M, Abualreesh MH, Abdel-Daim MM, Salem SMR, Askary AE, Assar DH (2021) Exploring the multimodal role of Yucca schidigera extract in protection against chronic ammonia exposure targeting: growth, metabolic, stress, and inflammatory responses in Nile tilapia ( Oreochromis niloticus )
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measured the content of acylcarnitines in plasma, DBSs, bile spots, and urine using FI-MS/MS and derivatization analysis (Smith and Matern, 2010)
2019;doi:10.3389/fphar.2019.01350
If the FDA hasn't shut these products down, they must be permitted