Best Vitamins to Take on Mounjaro UK: What You Actually Need

You're on Mounjaro. The weight is coming off. Your jeans fit again. Brilliant. But here's the thing nobody in the weight loss space is talking about honestly: your body still needs the same nutrients it always did. You're just giving it dramatically fewer of them.

This isn't fear-mongering from a supplement company trying to sell you something (although, yes, we are a supplement company and we are going to mention our product — we're upfront like that). This is basic maths. Eat 40% less food, get 40% fewer nutrients. Your body doesn't send a memo to your organs saying "we're on Mounjaro now, everyone scale back your requirements." It doesn't work like that.

What Mounjaro Actually Does to Your Nutrition

Tirzepatide suppresses your appetite and slows gastric emptying. That's the mechanism. That's why it works for weight loss. The unintended consequence is that when your appetite drops to the point where you're eating one proper meal and picking at the rest, the vitamin and mineral intake drops with it.

Research published in Obesity found that patients on GLP-1 receptor agonists consistently fall below recommended intakes for multiple micronutrients. The usual suspects: Vitamin D (already a disaster in the UK), B12 (especially if you're eating less meat), iron (especially for women), magnesium, zinc, and calcium. These aren't obscure nutrients. They're the ones responsible for your energy, your hair, your immune system, and your ability to think straight.

The Vitamins That Actually Matter

Vitamin D3. One in five UK adults is already deficient before Mounjaro enters the picture. Between October and March, you literally cannot make it from sunlight — the sun is too low. Add reduced dietary intake and you've got a compounding problem. 1,000–2,000 IU daily, paired with K2 so the calcium goes to your bones and not your arteries. Most supplements skip the K2 because it costs more. We don't skip it.

B12. The energy vitamin. Also the "I can't think straight and I don't know why" vitamin. If your meat and dairy intake has dropped (which it almost certainly has), B12 supplementation moves from "nice to have" to "probably essential." If you're also taking metformin, it's non-negotiable.

Iron. Particularly relevant if you're a woman of childbearing age. Less red meat = less heme iron = the kind of tiredness that no amount of coffee fixes. That fatigue you're blaming on Mounjaro? Might be iron.

Zinc and Magnesium. Between them, they're involved in about 600 different processes in your body. Magnesium alone handles muscle function, sleep quality, and glucose metabolism. Zinc keeps your immune system from falling over. Both drop when food intake drops.

Biotin and Collagen. The hair question. Everyone on Mounjaro forums is talking about hair thinning. It's called telogen effluvium and it's driven partly by rapid caloric deficit and partly by inadequate protein and micronutrient intake. Biotin supports keratin production. Marine collagen provides the amino acids your hair follicles need. Neither is magic, but deficiency makes everything worse.

What You Don't Need

You don't need to spend £80 a month on a "GLP-1 support stack" that's just a repackaged multivitamin with a trendy label. You don't need megadose anything — the Calgary vitamin D study proved that 10,000 IU daily actually decreased bone density. More is not better. And you absolutely don't need seventeen separate bottles on your kitchen counter. That routine lasts about twelve days before it collapses and everything goes in the drawer.

What you need is comprehensive coverage in a format you'll actually stick with. Which — surprise — is exactly why we built GUUDIES the way we did.

Six Gummies. Thirty Seconds. Sorted.

One daily pouch. Six gummies covering your multivitamin and greens (29+ vitamins, minerals, 14 superfoods), marine collagen and biotin for hair and skin, ACV and ginger for the digestion issues Mounjaro is probably giving you, a six-mushroom complex for focus, sea moss for 92 trace minerals, and metabolic support with saffron and chromium.

Related Reading

Supplements to Take on Ozempic UK: Filling the Nutrition Gap · Mounjaro Fatigue and Brain Fog: Is It the Medication or Your Diet? · Hair Loss on GLP-1 Medications: Which Supplements Actually Help · See our GLP-1 nutrition page · See full ingredient breakdown · what Natural GLP-1 support means in GUUDIES · how GUUDIES Natural GLP-1 differs from medication · what you get in one daily serving · Our Story

Three calories per gummy. 0.4g sugar — less than a single blueberry. Nothing that interferes with tirzepatide. No pills, no powders, no scoops, no blender.

Try Guudies today and fill the gaps your smaller plate leaves behind.