l carnitine rich food l-carnitine sources L-carnitine is a naturally occurring amino acid derivative that is often taken as a supplement though it is made in human L-Carnitine | Linus Pauling Institute

Biswas K, Alexander KD, Francis MM (2022) Reactive oxygen species: angels and demons in the life of a neuron

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In the Teichman et al

Topical penetration of intact GHK-Cu through intact stratum corneum is poor because the molecule is polar and hydrophilic

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If storage is sub-optimal (room temperature, high humidity, light exposure), expect significantly shorter viability (perhaps only several months for powder, or days for solution)