Effects of oral testosterone undecanoate on growth, body composition, strength and energy expenditure of adolescent boys. - PubMed - NCBI This study only used 40mg a day in youngsters vs. studies of 200-over 300mgs in males that achieved higher blood levels in “range”That's my (current) understanding. There are other studies with 120mg daily oral doses of T undecanoate and it only suppressed 20% of the people despite absorbing well with a meal. I think T base taken in a single dose similar to DHEA (e.g. no more than 5mg per dose) taken once or twice daily will probably have minor (if any) suppressive effects as it would mimic physiolgical/endogenous T synthesis.