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On The JabDr. Nick Robertson, MD
On The Jab

The best supplements for your first month on a GLP-1 — buy two, not seven

Week one is not the time to build a stack. It is the time to find out how your body handles the drug, with the smallest number of variables you can manage.

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Dr. Nick Robertson

Founder & Editor

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2 min read
Medically reviewed
Clinically reviewed

The most common mistake in month one is buying everything at once.

One variable at a time

You are starting a drug with a real side-effect profile. If you start it alongside five supplements, and you feel unwell on day nine, you have no way of knowing what to stop.

That is not a theoretical concern. It is the single most common reason people end up abandoning both the supplements and the medication.

Ranked · first-month GLP-1 supplements

How this was ordered: Ranked for a starting dose, where side effects are unpredictable and every added variable makes them harder to attribute. Preference goes to products that address the problems that actually show up in weeks one to four — dehydration, nausea, constipation — over anything preventive.

#ProductKey specPriceBest for
1GLP-1 FoundationMinome5,000 mg creatine + 1,000 mg sodium electrolytes$39.99/mo subThe two things that matter from day one
2Ginger capsules or chewsGeneric / Gin Gins500–1,000 mg ginger daily~$8–15/moThe symptom most likely to make you quit
3Psyllium huskMetamucil / generic~3 g soluble fibre, start at half~$10–15/moWeek two onward
4Basic Nutrients 2/DayThorneComprehensive multivitamin · NSF Certified for Sport~$36/moLater, if intake stays very low
5GLP-1 CompanionMinome40 B CFU · 4 named strains + FOS$39.99/mo subMonth two, not month one

  1. 1. GLP-1 Foundation

    Dehydration arrives in week one and lean mass starts leaving immediately, and this covers both in a single drink at a point when you do not want to be managing a pill organiser. One product, one habit, two of the four problems handled.

    Against it The sodium load is not right for everyone with high blood pressure, and creatine's early water weight can be demoralising in the exact fortnight you are watching the scale hardest. Weigh yourself before you start, then leave it alone.

  2. 2. Ginger capsules or chews

    Nausea peaks early and is the most common reason people abandon the drug in month one. Ginger is cheap, well tolerated, and has real randomised evidence at around a gram a day.

    Against it Modest effect against a pharmacological cause. If nausea is stopping you eating or drinking at all, this is not the answer and your prescriber is.

  3. 3. Psyllium husk

    Constipation typically shows up in the second or third week as food volume falls. Starting psyllium at half a dose before it becomes a problem is easier than fixing it afterwards.

    Against it Requires real water intake to work and worsens things without it. Do not start it in the same week as anything else, or you will not know what caused what.

  4. 4. Basic Nutrients 2/Day

    A properly formulated multivitamin becomes worth having once your intake has been low for a sustained period.

    Against it Almost nobody needs this in month one. Micronutrient status does not collapse in four weeks, and a pharmacy multivitamin at a fifth of the price covers most of it anyway.

  5. 5. GLP-1 Companion

    A well-built daily synbiotic for ongoing gut comfort once things have settled.

    Against it Deliberately last. Probiotics take around four weeks to show anything, which means starting one in week one guarantees you will not be able to tell whether it or the drug caused whatever happens next.

Prices checked September 2026 and change often. No link on this page is an affiliate link, and no brand listed has paid for, reviewed, or been shown this ranking before publication.

What the first four weeks actually look like

Week one is usually mild — the starting dose is deliberately sub-therapeutic. Nausea, if it comes, tends to appear within 48 hours of the injection and settle.

Week two and three are when reduced food volume starts showing up downstream: constipation, less fluid, the first cramps.

Week four is typically a dose increase, and the pattern restarts one step higher.

What to skip entirely for now

Berberine, appetite suppressants of any kind, anything marketed as raising natural GLP-1, fat burners, and detox products.

The first three are redundant on a drug that suppresses appetite pharmacologically. The last two were never a good idea.

Common questions

What supplements should I start with on a GLP-1?
Electrolytes and creatine, and ginger if nausea is an issue. Add fibre in week two or three when constipation typically appears. Everything else can wait, and waiting makes it far easier to work out what is actually causing any symptom you develop.
Should I take supplements in my first week on Ozempic?
Keep it minimal. The first week is when you learn how you personally respond, and every additional product makes an unexpected side effect harder to attribute. Hydration is the one thing worth doing from day one.
When does constipation start on a GLP-1?
Commonly in the second or third week, as reduced food volume works through, and again after each dose increase. Starting soluble fibre at a low dose before it appears is easier than treating it once established.
How long before I know if a supplement is working?
Electrolytes work within a day or two. Fibre takes three to five days. Creatine takes about three to four weeks to saturate muscle. Probiotics need four weeks minimum. Judge each on its own timescale, and change one thing at a time.

Sources

  1. 01

    Wilding JPH, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity (STEP 1). N Engl J Med. 2021;384:989-1002.

  2. 02

    Kreider RB, et al. ISSN position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18.

  3. 03

    Lete I, Allué J. The Effectiveness of Ginger in the Prevention of Nausea and Vomiting during Pregnancy and Chemotherapy. Integr Med Insights. 2016;11:11-17.

  4. 04

    McRorie JW, McKeown NM. Understanding the Physics of Functional Fibers in the Gastrointestinal Tract. J Acad Nutr Diet. 2017;117:251-264.

Editorial standards

Written by Dr. Nick Robertson, MD. Clinical content last checked September 8, 2026. On The Jab takes no money from pharmaceutical companies, telehealth platforms or compounders, and uses no affiliate links. Read our policy.

This article is journalism and general education, not medical advice. Talk to your own clinician before changing any treatment.

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