My straight answer would be MK 677 but it is better to use SARMs from Melanotan Express. Yes, you can consider this MK 677
https://www.melanotanexpress.com/product/mk-677-25mg-per-ml-30ml-bottle/ product to grow muscles quickly. MK 677 is basically known for producing growth hormone and growth factor IGF1. This hormone has the ability to tone your body into a muscular shape with great bone density. Compared to muscle-building steroids and other products, it doesn't affect your liver, kidneys, or sleeping pattern.
Moreover, MK 677 helps users to fight against aging and muscle reduction. You can simply get good muscles by using this product but don't take an overdose. Yes, its misuse can lead to different health issues and if you have diabetes, it is better to consult your GP first before taking this product. Otherwise, it is all set for you and you can start using it with tiny doses before the workout.