Microdosing

Microdosing is an informal term for taking a lower dose of hormones than a standard plan, usually to get changes more slowly or to aim for only some of them. It has no fixed medical definition. It is used most often about testosterone, and most often by non-binary people.

Where you'll meet it

In forums and on social media far more than in clinics. Prescribers are more likely to say "low-dose" and to talk about setting a lower target for your blood levels. The word was borrowed from other contexts, and it arrived without a definition: people use it for anything from a slightly reduced dose to a very small one. Two people who both say they are microdosing may be taking very different amounts.

What it means for you

A lower dose generally means changes arrive more slowly and may stop at a smaller point. What it does not do is choose which changes happen. Hormones act on the same body systems whatever the dose, and the same kinds of change come broadly in the same order.

Some changes are sensitive to small amounts. On testosterone, voice deepening and clitoral growth can begin at low doses, and both are permanent. On estrogen, breast development starts early and stays once established. Others, such as fat redistribution, skin texture, body hair and muscle, tend to be slower, more dose-dependent and more likely to drift back if you stop. Is HRT reversible? sets out which are which.

So the useful question is not "what dose gets me X without Y", because nobody can answer that reliably, but "which changes I want are likely at a lower level, and which changes I do not want are still likely, and are they permanent?"

How it is set up

There is no standard microdose, and this glossary is not the place for one. A prescriber agrees a plan with you, aims for a lower blood level than a full binary target, and adjusts it to your results and to what is changing. Monitoring is the same as on a standard plan: bloods roughly every 3 months in the first year, then once or twice a year once stable. Blood tests and monitoring covers what is checked.

Some people use a low dose as a starting point to see how they feel before deciding whether to go further. Others take hormones until they have the changes they want, then stop or reduce, which is something to plan with a prescriber rather than do alone.

Common questions

"A low dose is safer." Not automatically. Low-dose regimens have been studied far less than standard ones, so nobody has a reliable table of what a given low dose does over time. That is not a reason to avoid it, but it is a reason to keep expectations loose and keep up with blood tests.

"Low-dose testosterone is contraception." It is not, and it may not stop periods either. If you have sex that could lead to pregnancy, you need separate contraception; periods on testosterone explains the options.

"A little estrogen on its own is enough." On feminizing hormones, a low dose of estrogen without an anti-androgen can leave testosterone high enough that little changes, or give an uneven mix.

"Bones take care of themselves." Your bones need a reasonable level of some sex hormone, estrogen or testosterone. If a plan suppresses your own hormones, for example with a GnRH agonist, and only partly replaces them, bone health needs watching.

What to ask

Say what you actually mean by microdosing, in terms of the changes you want and do not want, rather than using the label. Ask what blood level the prescriber is aiming for, how often they will check, and how you would stop or reduce later. Non-binary and low-dose HRT covers the conversation in full.

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