[2026 update] Storing lyophilised material long term: what governs the shelf life

Counterpoint on Storing lyophilised material long term, offered without confidence: the same observation is consistent with a much duller explanation, and nobody has ruled the dull one out.

Clarity is a weak test. A solution can lose a significant fraction of its active content to degradation or adsorption while remaining perfectly clear.

Not the answer, but possibly the question that gets there.

Picking up post #41: that is the part I would want checked first.

Storing lyophilised material long term has a well-known answer and a correct answer, and the interesting work is establishing that they are the same. Nobody has done that here yet.

This is the first time the answer has come with its own limits attached. Appreciated.

Where I would push back on the Storing lyophilised material long term consensus is the confidence, not the direction. The direction looks right. The confidence is borrowed.

The two questions that get merged here are whether material is degraded and whether it is contaminated. Storage affects both and they need different answers and different tests.

I would put the burden of proof on the interesting explanation, not the dull one.

Something worth flagging about Storing lyophilised material long term: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern and not a coincidence.

Building on post #101 rather than restating it.

What I would want before treating Storing lyophilised material long term as settled: the method, the sample, and whether anyone tried to find the opposite result. Two of the three are usually missing.

A note on scope: what I am saying about Storing lyophilised material long term applies to the case in the first post and I would not extend it further without checking.