GLP-1 'getting back on it' content: what the science says

What did @chanelica.r actually say?

The short version: she's been skipping her tirzepatide injections for weeks at a time, feeling fatigued and inflamed, and started taking an NAD+ supplement alongside something called a "GLP-1 booster" from IVYRX. Her claim is that these two supplements together gave her enough energy to return to Pilates three times in one week, and that they help control inflammation "even if I still am skipping my shots." That last part is the one worth examining closely.

She's also transparent about some real struggles: muscle loss after GLP-1 use, difficulty hitting protein targets, and motivational slumps. Those are common, documented experiences. But the leap from "I feel better" to "these supplements compensate for skipping tirzepatide" is where the science stops cooperating.

Does the science back this up?

For NAD+, there is legitimate research, but it does not support the specific claims made here. Older cells and metabolically stressed individuals do show declining NAD+ levels, and preclinical work suggests NAD+ precursors like NMN and NR can influence mitochondrial function. But human trials on energy and fatigue in otherwise healthy or GLP-1-using adults are thin.

A 2023 randomized trial by Yoshino et al. in Cell Metabolism found NMN supplementation improved muscle insulin sensitivity in postmenopausal women with prediabetes, but did not show significant fatigue or energy benefits in the broader population. The "anti-aging and anti-inflammation" marketing attached to NAD+ supplements runs well ahead of what controlled human trials actually show.

The "GLP-1 booster" label is a red flag. No over-the-counter supplement has been shown in peer-reviewed trials to meaningfully replicate or amplify GLP-1 receptor agonist activity the way tirzepatide does. Berberine, often marketed this way, shows modest effects on blood glucose in some studies, but the magnitude is not comparable to prescription GLP-1 medications.

What did they get wrong (or right)?

She got the muscle loss problem right. Research published by Wilding et al. (2021, NEJM) confirmed that roughly 40% of weight lost on semaglutide can come from lean mass, not fat. That is a real issue, and her struggle to rebuild muscle while increasing activity and protein intake is consistent with what the literature describes.

What she got wrong is the implicit suggestion that a supplement stack can substitute for prescribed medication. Tirzepatide works by activating GIP and GLP-1 receptors at a pharmacological level. When you skip injections, you are not just losing an "energy boost," you are losing receptor-level metabolic signaling that no current dietary supplement replicates. The inflammation returning when she skips shots is likely tied to that receptor activity, not something an NAD+ capsule can offset.

Calling a supplement a "GLP-1 booster" without regulatory backing is also a marketing claim, not a medical one. The FDA does not recognize that category for over-the-counter products.

What should you actually know?

If you are on tirzepatide or semaglutide and skipping injections two to three weeks at a time, that is a clinical conversation to have with your prescriber, not a gap to fill with supplements. Dose consistency matters for metabolic outcomes. A 2022 analysis by Davies et al. in Diabetes Care showed that treatment interruptions are associated with weight regain and glycemic rebound, and the effects are not linear.

NAD+ precursors are not dangerous for most healthy adults, and the fatigue and mitochondrial angle is at least biologically plausible. But "biologically plausible" is not the same as "clinically proven." Taking NAD+ because you feel tired on a GLP-1 medication is not the same as addressing why you are tired, which could relate to protein insufficiency, disrupted sleep, caloric deficit, or undertreated anemia.

The combination of these two supplements has not been studied in GLP-1 users. No trials exist. Any claim about synergy between them is speculation, not science.

• Talk to your prescriber before adding supplements to a GLP-1 regimen.
• Protein targets for people on GLP-1 medications are generally higher than baseline, around 1.2 to 1.6 grams per kilogram of body weight per day, to preserve lean mass.
• "GLP-1 booster" is a marketing term with no regulatory definition.