# An imagined mineral spring

> About Dripping Springs Med Spa — Dripping Springs Med Spa is my research site about thymulin and zinc. The med-spa name is an editorial title; there is no business or medical advice here.

**About this site**

I’m interested in composition: the small ingredient whose removal changes the whole experiment.

## Dripping Springs Med Spa

Dripping Springs Med Spa is the name of my research site. There is no med-spa business behind it, and no appointments, prescriptions or products are available here. The name’s springs suggest water carrying minerals; they make no claim about a real spring, a location or a local service.

These essays are my response to published research on thymulin and zinc. They are not medical advice. A question about a laboratory preparation can be fascinating without becoming a reason to change somebody’s treatment. Decisions about personal health need care that a research essay cannot provide.

## Removal and replacement

Subtraction is an appealing experimental habit. It puts a generous story under pressure. In [the metal-removal study](https://pubmed.ncbi.nlm.nih.gov/6957870/), the activity vanished, zinc restored it and the alternative metals performed less well. That is a much more particular story than the phrase mineral-rich can tell.

That particularity suits my temperament. A precise ratio beats a vague abundance in my estimation. The human and mouse findings add further complications, especially when a changed activity might involve the surroundings of a peptide as well as its source.

There is a pleasing severity to the substitution test: a replacement has to earn its place. The weaker substitution is equally absorbing, because its lesser activity presses the explanation harder than another successful replacement would. I’m curious enough to follow those complications, and stubborn about the setting in which a result occurred. The [human zinc experiment](/human-zinc) and the [ageing mouse tissue](/ageing-thymus) deserve their own space. An adult with mild deficiency, an old mouse and a cultured organ each bring a different question to the spring.

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My essays at Dripping Springs Med Spa examine published research on thymulin and zinc; this research site has no med-spa business, and its pages supply no medical advice.