Still, peptides can influence hormone pathways, so they should not be treated like casual supplements
Persistent fatigue, brain fog, low mood, weight gain, tingling in the hands or feet, frequent illness, post-COVID fatigue, or feeling generally "off" despite eating well and sleeping enough, especially if you're vegetarian, vegan, over 50, on metformin or a long-term acid reflux medication, or have a history of low B12 or pernicious anemia
My honest read for most people walking in for skin and hair is start topical, and add a supervised injectable only when the goal is systemic recovery and after we rule out the reasons someone lands in the group of who should avoid peptides
(Think wrinkles and sagging skin etc)
Tripathi A, Lammers KM, Goldblum S, Shea-Donohue T, Netzel-Arnett S, Buzza MS, Antalis TM, Vogel SN, Zhao A, Yang S, Arrietta MC, Meddings JB, Fasano A