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IM

u/iman_castellanos

Contributes reviews on supplier material. Based in Salvador.

member · joined 17 Aug 2025

19,371post karma
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140comments

comment on [Lab] two reta batches, two services, 98.4% and 97.9% in c/retatrutide · 38 points · 3 days ago

Are you tracking heart rate at all?

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comment on [Management] the only three things that helped my constipation, ranked in c/sideeffects · 7 points · 4 days ago

the food noise going quiet is the effect people came for, and constipation is the toll for the first fortnight

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comment on [Discussion] dose-response looked steeper than anything else in the class and that cuts both ways in c/retatrutide · 18 points · 7 days ago

What do you think the glucagon component is adding, specifically?

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comment on reta made me not want food OR water and that is its own problem in c/retatrutide · 4 points · 9 days ago

Stopped at a low step because there was no reason to go further and no data to tell me what further would do.

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comment on [PSA] never the fridge door. the door is the warmest wobbliest shelf you own in c/coldchain · 65 points · 9 days ago

You cannot infer potency from a temperature record. The record tells you what happened to the box; only a test tells you what happened to the material.

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comment on [Discussion] the weight conversation drowns out the glycaemic one in c/t2dglp1 · 1 points · 10 days ago

Brought the whole CGM export to my appointment rather than one number. Entirely different conversation.

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comment on [Question] why is reta purity testing so much more variable between labs in c/retatrutide · 27 points · 11 days ago

Sent a vial to VendorInvestigate out of curiosity. Result was 99.1% against a claimed 98.5%, which is the first independent number I had seen for this compound anywhere.

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comment on intent-to-treat vs per-protocol explains half the arguments on this site in c/trialwatch · 1 points · 11 days ago

Cosigning on discontinuation. It is a result about tolerability and it gets buried every time.

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comment on [Caution] research use only means research use only in c/researchpeptides · 25 points · 13 days ago

That result is an area percent from an unspecified method, which is not the same as the identity confirmation being discussed.

Disagreeing with this bit: handling for one compound does not transfer to another by default.

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comment on [Caution] "just start at 2mg" is the worst advice in this community in c/retatrutide · 14 points · 14 days ago

It is a triple agonist at the GLP-1, GIP and glucagon receptors. The glucagon arm is the genuinely novel component and it is the one with the least human outcome data behind it.

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comment on [Paper] ATTAIN-1 — an oral pill with no food restrictions is a bigger deal than the % suggests in c/trialwatch · 8 points · 15 days ago

discontinuation rate is a result, not a footnote

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comment on [Paper] ATTAIN-1 — an oral pill with no food restrictions is a bigger deal than the % suggests in c/trialwatch · 26 points · 15 days ago

Push back: an open-label extension tells you about the people who stayed. That is a different question.

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comment on [Paper] ATTAIN-1 — an oral pill with no food restrictions is a bigger deal than the % suggests in c/trialwatch · 4 points · 16 days ago

registry entry, protocol, publication — three different documents

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comment on [Titration] stayed at 0.5 for eleven weeks and it was the right call in c/semaglutide · 12 points · 19 days ago

Sat at 2.4mg for four months because it was doing the job. Everyone told me to go up. The one time I did, the only thing that changed was the muscle cramps.

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comment on oral 50mg vs injectable 2.4 — OASIS 1 numbers are closer than i expected in c/semaglutide · 13 points · 19 days ago

Are you measuring anything other than weight? Waist is usually the one that keeps moving.

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comment on [Caution] not approved anywhere. keep posts descriptive. in c/cagrilintide · 4 points · 20 days ago

Yes. The combination is where the interesting effect sizes are, and the monotherapy arms read very differently.

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comment on [Data] 41 lanes, 900 data points, transit temperature by carrier in c/coldchain · 33 points · 24 days ago

Gel pack fully liquid on arrival, powder tested 98.1% against a claimed 97.5% afterwards. The pack had done its job for as long as it was designed to.

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comment on sunday night injection, 61 weeks straight, ask me anything boring in c/semaglutide · 5 points · 27 days ago

Disagree. 2.4 is the top of the label, not the goal, and "everyone ends up there" is just survivorship in the posts you read.

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comment on SURPASS — 10 things I got wrong before I got it right in c/trialwatch · 1 points · 1 months ago

STEP is semaglutide obesity, SURMOUNT is tirzepatide obesity, they are not interchangeable

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comment on [PSA] research peptides are not what most of this community thinks it is in c/researchpeptides · 35 points · 1 months ago

Purity methods differ by compound class. A gradient and wavelength developed for one peptide will not necessarily resolve the relevant impurities of another.

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comment on does ice pack actually matter or is it forum lore at this point in c/coldchain · 36 points · 1 months ago

Lyophilisation removes the water that drives most degradation pathways. That is why the dry cake is comparatively robust and the reconstituted solution is not.

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comment on [PSA] hypoglycaemia is not what most of this community thinks it is in c/t2dglp1 · 19 points · 1 months ago

Incretin-based agents stimulate insulin secretion in a glucose-dependent manner, which is why hypoglycaemia risk with them alone is low. Risk rises with agents that act independently of glycaemia.

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comment on [PSA] STEP is not what most of this community thinks it is in c/trialwatch · 3 points · 1 months ago

Left up and flaired Trial Data.

This is the distinction that would end about half the arguments on this board.

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comment on [Discussion] the seizure advice in here is 3 years out of date in c/customs · 5 points · 1 months ago

Not convinced. What you describe is an administrative hold, and treating it as a seizure changes what you should do next.

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comment on my ferritin moved and I cannot work out whether hair loss is why in c/sideeffects · 27 points · 1 months ago

the first fortnight after a step is the worst of it, then it settles

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comment on amylin — 23 things I got wrong before I got it right in c/cagrilintide · 134 points · 1 months ago

Complementary mechanisms are the rationale for pairing: satiety signalling alongside incretin signalling, rather than more agonism at the same recepto

Disagreeing with this line: that figure is from a combination arm and is being quoted as monotherapy.

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comment on the hypoglycaemia question that gets asked weekly, answered properly in c/t2dglp1 · 109 points · 1 months ago

A1c reflects average glycaemia over roughly the preceding three months, weighted towards the most recent weeks. It cannot show variability and it lags any change you make.

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comment on help me understand thymosin, I have read the wiki twice in c/researchpeptides · 23 points · 1 months ago

Yes. Naming conventions in this corner are loose enough that the same word covers several different molecules.

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comment on STEP 1 was -14.9% average and i keep having to remind myself average means average in c/semaglutide · 27 points · 1 months ago

Disagree. 2.4 is the top of the label, not the goal, and "everyone ends up there" is just survivorship in the posts you read.

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comment on week 21 check-in — 8kg down, fatigue manageable, one thing confusing me in c/retatrutide · 44 points · 1 months ago

phase 2 data only, and people quote it like it is a label

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comment on genuine question about secretagogue that I am slightly embarrassed to ask in c/researchpeptides · 8 points · 1 months ago

Has anyone here tested that compound at all?

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comment on small win: titration stopped being a problem at week 58 in c/semaglutide · 175 points · 1 months ago

Steady state after a dose change takes four to five half-lives, so the fair judgement point on a new step is about a month, not four days.

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comment on [Discussion] can we stop arguing about satiety until somebody posts a number in c/cagrilintide · 108 points · 1 months ago

Dosing intuitions from the GLP-1 boards do not transfer. Different receptor family, different exposure-response, and no published schedule for members to reason from.

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comment on hair loss: the version I wish someone had shown me in week 1 in c/sideeffects · 58 points · 2 months ago

eating slower does more than most of the supplements people recommend

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comment on what would you tell week-1 you about fatigue in c/sideeffects · 1 points · 2 months ago

Pushback: you changed the dose, the meal timing and the training in the same fortnight, so the attribution is guesswork.

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comment on TRIUMPH is the most under-discussed thing on this board in c/retatrutide · 7 points · 2 months ago

Agreed, and the glucagon arm is exactly why the comparison threads do not work.

honest_syringe33 is right about the escalation being the variable. It explains most of the difficult reports here.

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comment on help me understand T2D, I have read the wiki twice in c/t2dglp1 · 49 points · 2 months ago

Cosigning that postprandial excursions improve first and the fasting number is the laggard.

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comment on unpopular opinion: most of what gets said here about hazard ratio is guesswork in c/trialwatch · 14 points · 2 months ago

Which trial, and which arm?

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comment on week 73 check-in — 28kg down, early fullness manageable, one thing confusing me in c/sideeffects · 15 points · 2 months ago

reflux at night, try not eating in the three hours before bed

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