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However, these compounds should be administered separately due to different pharmacokinetics and storage requirements

So the practical takeaway is not oral is better or SC is better. It is: pick one route, follow the documented per-dose figure for the vial you have, and keep the route constant so that whatever you observe is not confounded by a mid-stream route change

Preferred subcutaneous sites include the abdomen and the outer upper arms, providing straightforward access for individuals administering their own injections: Abdomen: Injections are given at least two inches away from the navel, allowing for a broad area of fat tissue

Inject during the fasting window, not during the eating window

swelling of the ankles or feet