Prefix. Suffix. Infix. Outfix?

My prefix for gains
My suffix is bled
My infix in veins
My outfix is bed

What am I?

My guess:

beancod (or mostly bean-cod)

My prefix for gains

beancod; a variety of beans are good for muscle gain

My suffix is bled

beancod; cod is a type of fish and fishes are generally bled before cooking

My infix in veins

beancod; veins carry deoxygenated blood which also contains $$CO_2$$ back to the heart

My outfix is bed

beancod; bed is its outfix since it is split in two parts 'be' and 'd' around 'anco'

• An obscure word, but you got it! :) – Avi Feb 14 at 14:04
• I'm quite surprised this is the answer, the third line especially seems very loose. Was this the intention @Avi ? – hexomino Feb 14 at 15:13
• @hexomino Yes - it was a precarious balance between a fairly obscure word, a rhyme, and an outfix – Avi Feb 14 at 15:14
• TBH, I'm quite surprised myself @hexomino, it was a wild guess after an hour of searching. – Ébe Isaac Feb 14 at 15:15