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Someone posted a photo and question on a forum after mixing two vials labeled "mt2" and "bac water" and leaving them in the fridge for a month. They say they didn’t touch the mixture for the last 20 days, then noticed it looked “weird” — maybe cloudy or with bubbles — and asked if it’s still safe to use. The post shows the person gently turning the vial and seeing it clear up, then asking for advice. "MT2" usually refers to melanotan II, a lab-made peptide people sometimes use to darken skin or for tanning. "Bac water" is short for bacteriostatic water, which is sterile water with a tiny preservative added so vials can be used more than once. Peptides like melanotan II come as a dry powder that you reconstitute (mix) with that sterile water before use. They are not prescription medicines approved by health authorities for most of these uses, and people who use them often do so outside medical supervision. From the snippet it looks like just one person’s after-reconstitution observation — not a formal study. Cloudiness, particles, or changes after sitting can mean different things. Sometimes trapped air bubbles or small clumps dissolve after gentle swirling and the liquid becomes clear again; that’s usually fine. But if the solution stays cloudy, has floating particles, changes color, or smells odd, that can indicate contamination or that the peptide has degraded. There’s no way to tell safety or potency just from a photo or how it looks without lab testing. Why it matters: anyone who reconstitutes and injects peptides needs to know when a vial is still okay. Using contaminated or degraded injections risks infection, skin reactions, or getting a weaker or unpredictable product. People who keep reconstituted vials for a while to save money or convenience should be cautious because storage time and temperature affect stability. If you’re not sure, the safest choice is to discard it rather than inject. Caveats and risks: this post is anecdote-level; it doesn’t provide testing or an expert lab opinion. Melanotan II is not an FDA-approved cosmetic or medical product in many countries, so quality control is often absent. Bacteriostatic water extends usable time but doesn’t guarantee sterility forever. Never use a vial that is cloudy, contains flakes, is discolored, or has visible microbial growth. People with medical conditions, on medications, pregnant or breastfeeding should avoid such peptides and consult a doctor. If you suspect contamination or experience redness, swelling, fever, or other signs of infection after injecting, seek medical care. Bottom line: a vial that clears after gentle swirling might be fine visually, but without knowing the source, storage conditions, and without lab testing, the safest move is to discard it and get a properly manufactured product or medical advice before using injections.
Source: r/Peptides