As with any active, patch testing on a small area before full-face use is prudent, and anyone with very reactive skin or a known copper sensitivity should be cautious
Gondo et al, Growth Hormone-Releasing Peptide-2 Stimulates GH Secretion in GH-Deficient Patients with Mutated GH-Releasing Hormone Receptor, The Journal of Clinical Endocrinology & Metabolism, Volume 86, Issue 7, 1 July 2001, Pages 32793283, Mericq V, Cassorla F, Salazar T, Avila A, Iiguez G, Bowers CY, Merriam GR
Take Care, Have Fun!"
To relieve the congestion he takes 600-900 mg of NAC 3x per day
Eur J Appl Physiol Occup Physiol 64:4750 Masuoka N, Yoshimine C, Hori M et al (2019) Effects of anserine/carnosine supplementation on mild cognitive impairment with APOE4
Therefore, brands should describe the combination as complementary support rather than making guaranteed synergy claims