我都在问的乙酰壳糖胺（NAG）功效怎么样？功效成分的护肤品应该怎么选？

参考文献：

Kim J, Kim EH, Oh J, et al. Improvement of skin wrinkles and elasticity using a novel skincare product containing oligopeptide-34, acetyl hexapeptide-8, and acetyl glucosamine: a single-center, prospective, randomized, double-blind, placebo-controlled study[J]. Dermatologic therapy, 2019, 32(4): e12853.

Del Rosso J Q. The use of topical agents in rosacea: an update[J]. Cutis, 2012, 90(2): 73-84.

Kim H Y, Lee S, Lim S H, et al. Effects of topical application of acetyl glucosamine on skin whitening and wrinkle improvement[J]. Journal of the Society of Cosmetic Scientists of Korea, 2010, 36(4): 317-322.

Jin S P, Lee M Y, Jeon H B, et al. The preventive effects of topical application of a novel compound, acetyl-hexapeptide-8 (Argireline), on skin photoaging induced by ultraviolet irradiation[J]. International journal of cosmetic science, 2013, 35(3): 307-311.

Lio P A. Cosmeceuticals and integrative dermatology: overview and practical approach to treatment[J]. Journal of drugs in dermatology: JDD, 2009, 8(2): 113-119.

Wang Y, Hu L, Ma D, et al. acetyl glucosamine-loaded gold nanoparticles for targeted therapy of skin inflammation[J]. Nanoscale research letters, 2020, 15(1): 1-10.

Pilkington S M, Watson R E, Nicolaou A, et al. A randomized controlled trial of a cream containing topical 'caffeine' for rosacea-associated erythema and telangiectasia[J]. Journal of cosmetic dermatology, 2011, 10(1): 51-56.

Choudhary S, Kumar V, Singh N, et al. acetyl glucosamine: applications in cosmeceuticals and skin care products[J]. International journal of pharmaceutical sciences and research, 2016, 7(7): 2563-2568.