Posted by Mark Nessim
Reviewed by Dr. Mark, Physician & Formulator
If you've spent any time this summer wherever people compare notes on semaglutide or tirzepatide, you've met the word “microdosing” — taking less of the medication, or taking it less often, than the label calls for. STAT reported on the practice in May 2026 and described it as popular but largely unsupported by evidence. It has only grown since: telehealth platforms now offer reduced-dose programs as a product, and August's news cycle has been full of physicians being asked about the trend and answering carefully.
The reasons people give are practical — cost, side effects, maintenance after reaching a goal weight. This is a report on what the evidence says, not an endorsement or a warning: dosing is a decision for a patient and their prescriber, and nothing here is a recommendation to change how a medication is taken.
What the evidence says about microdosing
Very little, so far, in either direction. There is no controlled trial of reduced-dose GLP-1 regimens for weight maintenance, and the clinicians quoted in this month's coverage range from cautious to unimpressed. The approved doses of semaglutide and tirzepatide are the ones that were actually studied in the registration trials; below them, the honest answer is that nobody knows yet. “Unstudied” is not the same as “disproven” — but it is also not the same as “works.”
The question that doesn't scale with the dose
Here is what strikes a physician reading this debate: the entire argument is about the size of the dose. Nobody is debating the size of dinner. Whatever is happening in the pen — full dose, half dose, no dose at all — the question of what a person eats while their appetite is dialed down doesn't scale with any of it.
A review published this year in the journal Metabolites, on nutrition and muscle preservation during GLP-1 treatment, put numbers on that question. Consensus guidance recommends roughly 1.2 to 1.5 grams of protein per kilogram of body weight per day during active weight loss. In a cross-sectional study of current GLP-1 users cited in that review, only 43% reached even the 1.2 minimum — average intake was 77.3 grams a day — and about 40% of the day's protein arrived at dinner, the opposite of the spread-it-across-the-day pattern the same review recommends. (For a practical walkthrough of those targets, see How Much Protein Do You Actually Need on a GLP-1?)
And in the interest of honesty, here is what the evidence does not say: there is not yet a single randomized trial of protein supplementation specifically in people on GLP-1 therapy — the review notes the first is expected to report around 2027. What exists today is meta-analytic evidence from weight-loss interventions generally, where intakes above about 1.3 g/kg/day are associated with better muscle preservation. A strong signal, and unfinished science. We would rather say that plainly than pretend otherwise. It is the same standard we applied when we reviewed the evidence on BPC-157: enthusiasm is not data, and neither is dismissal.
Where creatine fits — and where the evidence is still young
ASP-1 is a whey isolate with creatine, collagen, L-glutamine, a prebiotic/probiotic complex, magnesium, zinc, and methylated B-12. The creatine is there because it carries the deepest evidence base in sports nutrition — roughly three decades of randomized trials for muscle and strength, with adverse events no more frequent than placebo — plus a newer literature on the brain: a systematic review and meta-analysis of randomized trials reports that supplementation may benefit memory and processing speed, most clearly in older adults.
The caveat: in GLP-1 users specifically, the same Metabolites review classes creatine as an adjunctive option supported mainly by indirect evidence. The muscle data is old and solid; the data in this exact population is young. Naming that gap is, we think, what makes the rest of this review worth reading.
The boring constant
None of the nutrition side requires a protocol. One scoop, once a day — there is no titration schedule for a protein powder, and no subreddit arguing about your scoop size. And if Saturday involves birthday cake, good: it's a birthday. Nobody eats perfectly, least of all people whose appetite changes from week to week, and a plan that leaves no room for an actual life isn't a plan.
“This powder is amazingly good. I have been using both vanilla and chocolate for a few months now and feel wonderful.”
— Leslie M. · Verified buyer
Whatever the dose debate settles on, the eating question will still be there — every day, at every dose, including zero. That constant is the one part of this story you can act on without waiting for a trial to read out.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
