Timing Protocol

When to Take GLP-1 Agonists

What researchers say about when, how and with what to take glp-1 agonists, and how strong the evidence is.

The verdict on GLP-1 Agonists overall

Leaning for

GLP-1 drugs are worth taking for people with obesity.

+2 18 sources: 6 positive, 9 partly, 3 negative

18 sources: 6 positive, 9 partly, 3 negative

Based on what researchers say in publicly available videos, not medical advice. Always consult your healthcare provider before starting, stopping, or changing any supplement.

Short answer

Once-weekly injection, at any time of day. Pair it with strength training and high protein (at least 1g per pound of lean body mass) to limit muscle loss (Peter Attia).

Full Protocol

Timing
Once-weekly injection, at any time of day. Pair it with strength training and high protein (at least 1g per pound of lean body mass) to limit muscle loss (Peter Attia).
Dosage
Doses rise slowly over months to limit gut side effects: semaglutide from 0.25mg up to 2.4mg/week, tirzepatide from 2.5mg up to 15mg/week (Peter Attia). See the week-by-week titration schedule below. A prescribing doctor sets the dose.
Form
Once-weekly injection under the skin is still the mainstay and leads on peak efficacy. Oral GLP-1s are now FDA-approved too: oral semaglutide (the Wegovy pill, Dec 2025) and the non-peptide orforglipron (Apr 2026). Some clinicians use compounded peptide versions at lower doses (Craig Koniver, on Huberman Lab).
Notes
This is a prescription drug, not a supplement. It needs a doctor's oversight, DEXA scans for body composition and blood work. Compounded versions from reputable pharmacies may offer lower doses, and cost is a real barrier (Peter Attia). Diet and lifestyle come first, before any drug (Mark Hyman).

What the evidence says about timing

No timing claim on GLP-1 Agonists has been checked yet. The timing notes above are not yet backed by counted mentions.

Where the sources disagree

Built from every credited researcher and cited study on each claim.

Leaning for

GLP-1 drugs are worth taking for people with obesity.

Supports it 6 sources
Partly 9 sources
Against it 3 sources

Researchers

Studies

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