Can Creatine Help You Protect Muscle on a GLP-1? w/ Kristin Kirkpatrick, MS, RD

Creatine may support performance during strength training, which helps explain the interest in it among people taking a GLP-1. Whether it protects muscle during medication-assisted weight loss is a more specific question, and it deserves a careful answer.

In episode 120, Ana Reisdorf talks with registered dietitian Kristin Kirkpatrick, MS, RD, about creatine, resistance training, water retention, and the practical questions that come with choosing a supplement. Kristin shares her clinical perspective, while Ana describes starting creatine during weight maintenance. Their conversation offers useful questions to explore without making one supplement the answer for everyone.

Four takeaways from the conversation

• Creatine is part of the muscle-health discussion. Kristin explains its role in muscle energy and emphasizes pairing it with resistance training.
• A change on the scale can have several explanations. Water retention can accompany creatine use, so an increase does not automatically mean increased body fat.
• Product form and convenience are different questions from effectiveness. The episode explores monohydrate, HCl, powders, and gummies without settling every comparison.
• Starting later still matters. Kristin describes patients who began strength training after starting a GLP-1. Their experiences are encouraging, but individual outcomes vary.

What does creatine do for muscle?

At about 6:17, Kristin explains that creatine is a compound stored mainly in skeletal muscle. She describes how it helps regenerate ATP, the energy supply used during demanding activity. That is why creatine often appears in conversations about repeated efforts such as lifting weights.

The NIH Office of Dietary Supplements reports that creatine can improve performance during repeated, short bursts of intense activity, including weightlifting. It also notes that responses differ among people. This evidence helps explain the interest in creatine alongside a training program; it does not establish that every GLP-1 user needs a supplement.

The GLP-1-specific question remains open. A September 2026 opinion paper in Clinical Nutrition proposes creatine as a possible addition to muscle-preservation strategies during GLP-1 treatment. Its authors describe the idea as a hypothesis and report that direct randomized trials in this setting are still needed. A plausible mechanism is a starting point for research, rather than proof of a treatment benefit.

How does creatine fit alongside protein and strength training?

Around 12:22, Kristin brings the discussion back to challenging the muscles through resistance training. She talks about creatine alongside protein and overall nutrition, rather than treating the supplement as a complete muscle-health plan.

For someone whose appetite has changed on a GLP-1, that broader view is useful. The conversation raises questions about eating enough, getting practical support with meals, and finding a manageable approach to training. It does not provide an individualized nutrition or exercise prescription. Your current food intake, health, medication, and activity all matter when discussing those needs with your care team.

Why might the scale rise after starting creatine?

At about 23:24, Ana says her weight increased after she became more consistent with creatine and started training more intensely. She is careful to say she does not know the cause.

Kristin discusses water moving into muscle cells, along with bloating and gastrointestinal discomfort some of her patients report. NIH also identifies water retention as a reason creatine can increase body weight. That gives one possible explanation for a scale change, but it cannot identify the cause of your own change from a number alone.

The useful distinction is between total body weight and the question you actually want answered. A scale reading by itself cannot tell you whether you gained fat, retained water, or changed muscle mass.

Monohydrate, HCl, gummies, and timing: what remains uncertain?

The product discussion starts around 16:51. Kristin describes differences in solubility and the experiences she has seen with creatine HCl. She also acknowledges that more comparative research is needed. NIH identifies creatine monohydrate as the most widely used and studied form. The episode should not be read as proof that HCl is superior or that a smaller serving works equally well for everyone.

They also discuss loading phases, timing, gummies, and mixing creatine into coffee. Kristin says she does not routinely use loading phases with her patients and does not have a firm evidence-based answer about coffee. The specific amounts and timing discussed belong to this conversation; they are not a dosing plan for the reader.

Brain health comes up too. Kristin describes emerging research and repeatedly calls for more data. This episode does not establish that creatine prevents Alzheimer’s disease, dementia, or cognitive decline.

Can you build muscle after you have started a GLP-1?

Near 32:05, Kristin shares examples of patients who became interested in strength training after starting treatment. Ana also explains that her own goal in maintenance is to build muscle. Those experiences challenge the assumption that starting a GLP-1 means your opportunity to work on strength has passed. They do not predict any one person’s outcome.

A useful next conversation with your care team can focus on your goals, your current nutrition and activity, and whether a supplement has a place in your individual situation. The aim is to understand your options and build a routine that fits your life.

Guest and resources

Kristin Kirkpatrick is a registered dietitian at Cleveland Clinic and president of KAK Consulting, LLC. Learn more through Kristin’s official bio, or connect through her Instagram. For food ideas, explore our high-protein snacks article and Diet & Lifestyle articles.

Episode sponsors: Tyde Wellness and Velogenix. These sponsor links may earn GLP-1 Hub a commission at no additional cost to you.

This article summarizes an educational podcast discussion and adds the linked research context. It is not personal medical advice.