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I know "28 days in the fridge once reconstituted" is the standard (and
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Started by B J
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10 replies
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5 people
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Last activity Apr 17, 2026
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B J
51 posts·first seen Nov 2025
OP
I know "28 days in the fridge once reconstituted" is the standard (and for good reason), but has anyone tried reta/tirz for 6-8 weeks with the same results?
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RekitRolf
264 posts·first seen Nov 2025
Yes and it's been fine, bit this is not advice
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RandomGuy11
155 posts·first seen Feb 2026
I have used up to 8 weeks without issue
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Cook
365 posts·first seen Feb 2026
Yes it usually fine most peptides are a lot more stable than people think. Is it ideal no. Will it still work most likely.
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B J
51 posts·first seen Nov 2025
Thanks, I know a lot of people have and will use it after 28 days. I haven't had any issues with a few other pins (PT141 is still potent after 6 weeks!), but it's good to get your input too.
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RekitRolf
264 posts·first seen Nov 2025
Yip the peptide is actually not the issue, it's the risk of bacterial growth. Even after 6months the peptide will be fine maybe less effect or some efficacy lost but will work. it's the risk of other stuff going on in the vial
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B J
51 posts·first seen Nov 2025
That makes sense; I keep 'em clean and put my faith in Hospira when I need to!
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Cook
365 posts·first seen Feb 2026
There’s story’s of older bodybuilders using tap water for their gh. 😂
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B J
51 posts·first seen Nov 2025
I can totally see the risks, and since I'm in London, I'm definitely not using the tap water!!
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T-Money
2 posts·first seen Mar 2026
what happens if u do... Infections?
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Cook
365 posts·first seen Feb 2026
Most likely there’s also other impurities in water non bacteria related that are most likely not great for you. It’s just funny to see how people swing from one extreme to another. Ie dirty needles, normal water, no alcohol wipes->full sanitation and pharma bac water 😂
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