Reta side effects: fast or slow?

Supplier variation in Reta tingling is real and not well documented - the excipients differ between sources and the reconstitution base matters. Fast-onset effects usually peak at 2-4 hours post-inject; the slow-build pattern suggests a different absorption curve, not necessarily a potency difference.
 
Reta's side effect profile runs milder than tirz on average, but onset is more variable - some people feel nothing in the first day and the response arrives later. The slower ramp is part of why the window is more manageable; the body gets more adaptation time before the dose steps up.
 
The two-day lag is consistent with Reta's slower distribution half-life - most people who switch to tirz report the side effect profile is noticeably cleaner, which matches the suggestion.
 
Non-GI side effects on Reta at the 84-hour titration pace tend to be milder than the GI stuff - most people notice energy and sleep shifts more than anything else. If GI settles on the current protocol, the Reta conversation with your doctor makes sense given the different mechanisms.
 
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