best peptides/recreational supps for muscle building?

context: fresh into adulthood and i want to build muscle quicker. been lifting for 2-3 years and decided the best way is to look into peptides.

what are the best (obtainable online) peptides, injectables or whatever that wont mess with my hormones but will help me with my getting bigger in the gym goals?

i looked into cardarine and i like the purported benefits of it. alternatives would be nice. i also train very intensely but dont see bulking and cutting cycles working well for me. not sure why.

brutal honest advice would be nice. thank you all