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There is no proof in the literature that sub-q absorbs slower...............sure there is less blood flow in adipose but the length of the ester side chain/injection site/injection volume will effect the rate at which the testosterone is absorbed.

Spike in e2 has more to do with dosage/frequency of injections as larger doses of testosterone injected once weekly or god forbid once every 2 weeks will result in higher supra-physiological peaks of testosterone followed by higher spikes in e2 as oppose to lower doses of testosterone injected more frequently (M/W/F or EOD or daily).