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This is the cholesterol-testosterone paradox,

8 , 336ra361 (2016)

Vitamin C injections can also boost your immune system and aid in collagen production for healthy skin

A 2021 retrospective observational study cited in the PMC literature directly compared BPC-157 alone versus BPC-157 combined with TB-500 in a knee injection protocol and found the combination to be associated with improved outcomes providing the first head-to-head comparative observation of the two compounds used together versus independently

You can see an example below: Subcutaneous needles are insulin syringes and the length of the need varies from 6mm to 12mm which is less than 1 cm