Adenosine deaminase deficiency (ADA). About 50% of SCID cases are of this type.

adenosine deaminase

Adenosine tablets are available, but adenosine is rapidly destroyed by acids and adenosine deaminase.

Adenosine monophosphate is mentioned as a prodrug, but even it seems to need to be injected.

I've seen ATP as a suppliment, but I have no idea how absorbable it is.

Several different immune system disorders are currently grouped under SCID: Swiss-type agammaglobulinemia. Adenosine deaminase deficiency (ADA). Autosomal recessive. Bare lymphocyte syndrome. SCID with leukopenia

Adenosine deaminase is an enzyme(EC3.5.4.4) involved in purine metabolism. It is needed for thebreakdown of adenosinefrom food and for the turnover of nucleic acidsin tissues.