The first month on a GLP-1 medication follows a predictable shape. Appetite drops sharply within days. Fluid intake falls with it, because a large share of daily water normally arrives inside food. Protein intake falls too, usually without the person noticing. Then, somewhere in week two or three, the side effects that people actually complain about arrive: constipation, fatigue, and the first signs that weight coming off is not all fat.
Almost everything sold to new GLP-1 users addresses one of those four things. The problem is that it all gets recommended at once, on day one, when most of it is not needed yet. This guide puts the same list in the order the problems actually appear, so you can buy the first two things now and the rest only if you need them.
This guide is general educational information, not medical advice. Storage rules, dose schedules and disposal requirements differ by medication and by state. Always follow the instructions printed on your own product label and ask your prescriber or pharmacist before changing anything.
Week One: The Two Things Worth Having Before You Start
Only two purchases are genuinely time-sensitive, because both address problems that begin immediately and are much easier to prevent than to correct.
Electrolytes. When appetite drops 20 to 40 percent, incidental fluid and sodium intake drops with it. Plain water does not replace sodium and potassium, which is why people who are drinking plenty still report headaches, dizziness on standing, and fatigue. A sugar-free electrolyte powder is the single cheapest intervention in this entire guide.
A way to measure protein. Not a supplement - a way to know. Protein is the variable that determines how much of the weight you lose is muscle rather than fat, and it is the one that quietly collapses when you are not hungry. You cannot manage it without a number.
Single-serving packets with sodium, potassium and magnesium. Mixes into plain water. The first thing to buy and the one most people skip until they already feel unwell.
View on Amazon →Removes the guesswork from protein. A scale that reads in grams turns 'I think I ate enough protein' into a number you can act on, which is the entire point.
View on Amazon →Week Two to Three: When the Side Effects Arrive
Slowed gastric emptying is part of how these drugs work, and the same slowing continues further down the digestive tract. Constipation is therefore not a sign something has gone wrong; it is the expected consequence of the mechanism. It responds well to fiber, but fiber added too fast to a gut that is already slow will make bloating worse before it makes it better. Start low.
Psyllium or similar, started at a low dose and increased slowly over a fortnight. Adding a full dose on day one is the most common self-inflicted mistake on GLP-1 medication.
View on Amazon →Ginger chews, acupressure bands and similar low-risk options. Nausea clusters around dose increases and usually settles; the point is getting through the week it appears.
View on Amazon →Week Three Onward: Protecting Muscle
This is the part of the first month that gets least attention and matters most. In the SURMOUNT and STEP trial programmes, a substantial share of the weight lost was lean mass rather than fat. That is not an argument against the medication. It is an argument for eating enough protein and giving your body a reason to keep the muscle it has.
Two purchases matter here, and only if you will actually use them. A protein powder solves the practical problem that hitting a protein target with a suppressed appetite is genuinely hard. Resistance training equipment solves the other half, and a pair of adjustable dumbbells at home removes every excuse that a gym membership creates.
The practical answer to hitting a protein target when you are not hungry. Look for 20g or more per serving and a flavour you will drink on a day when you do not want to.
View on Amazon →Resistance training is the signal that tells your body to keep muscle while losing weight. Adjustable pairs take one square metre and remove the travel excuse entirely.
View on Amazon →What to Skip in Month One
Being clear about what not to buy is worth as much as the list above. Continuous glucose monitors are genuinely interesting and almost never necessary in the first month for someone without diabetes. Compression garments address loose skin, which is a month-nine problem, not a week-three one. Body composition scales are unreliable enough at the consumer level that the number will mislead you before it helps.
None of those are bad products. They are simply answers to questions you do not have yet, and buying them now means spending money during the month when you are least certain you will stay on the medication.
If you buy nothing else, buy electrolytes and something that measures protein. Every other item on this page is a response to a problem you may not have.
The Rest of the Guides
Each of these goes considerably deeper than the summary above, including what to look for on a label and the mistakes that make each problem worse:
- Electrolytes and fiber supplements - the two side effects almost everyone gets
- Protein powders - hitting a target on a suppressed appetite
- Anti-nausea remedies - for dose-increase weeks
- Food scales - turning protein from a guess into a number
- Adjustable dumbbells - the muscle-preservation half
- Constipation relief - when fiber alone is not enough
- Travelling with your pen - storage, coolers and airports
- Injection supplies and sharps disposal - the recurring purchase nobody plans for
Also Worth Reading
- Clothes that fit while you are still shrinking — what to buy while your size is still moving, and what to have altered instead of replaced.
- What to keep buying in the maintenance phase — which of the month-one purchases still earn their place at month fourteen.