What Do GLP-1 Medications Not Tell You About Your Micronutrients?

GLP-1 medications reduce appetite and slow digestion, and those same mechanisms that drive weight loss can also quietly reduce your intake of key vitamins and minerals, most commonly vitamin D, B vitamins, and iron.^† A large retrospective study found more than 22 percent of adults starting these medications developed at least one diagnosed nutritional deficiency within a year. That's a conversation worth having with your prescriber, separate from the conversation about side effects like nausea.

The nutrition conversation is colliding with the GLP-1 conversation

Most GLP-1 conversations focus on weight loss results and gastrointestinal side effects. The micronutrient side gets far less airtime, even though it's a direct consequence of the same mechanisms that make these medications effective: reduced appetite and delayed gastric emptying.

What actually happens to nutrient intake on these medications

A large retrospective observational study of 461,382 adults newly prescribed GLP-1 receptor agonists found that 12.7 percent developed a diagnosed nutritional deficiency within 6 months, rising to over 22 percent within 12 months, with vitamin D and thiamine among the most common. A separate review synthesizing this and other studies notes that reduced caloric intake and delayed gastric emptying can independently affect nutrient absorption, compounding deficiency risk that's often already elevated in people with obesity before they start the medication.

The specific nutrients most commonly affected

Vitamin D and thiamine (vitamin B1) appear most frequently in the data, followed by other B vitamins and iron-related anemia. In one smaller, specific cohort, a retrospective study of Japanese patients who had prior bariatric surgery and were later started on semaglutide found declines in vitamin B12 and zinc over 12 months, alongside a dietary shift away from protein-rich foods. That study is small and specific to a post-surgical population, so it's a signal to watch for, not a universal finding, but it lines up with the broader pattern of reduced protein and micronutrient intake seen across the larger studies.

Supporting digestive comfort and micronutrient repletion

Nausea Sweets are organic lozenges formulated with active ginger or peppermint oil plus vitamin B6, made to help ease occasional upset stomach and digestive discomfort in a discreet, on-the-go format, which fits the nausea and appetite-suppression side of the GLP-1 experience without naming or addressing the medication itself.^† Premium Fertility Gummies include methylated folate, B12, zinc, and vitamin D, nutrients that show up repeatedly in the deficiency research above, and can help fill common nutrient gaps for women in the preconception window who are also managing appetite changes.^†

"The FDA does not regulate dietary supplements. So making sure that whatever you're taking is being made by a reputable organization is really important."

— Dr. Jummy Amuwo, Pharm.D., MPH, BCPS, Clinical Pharmacist and Board Certified Pharmacotherapy Specialist

"Every woman's health journey looks different, and there's no shame in whatever path gets you there. What matters is that you're supported the whole way, body and spirit both."

— Amy Suzanne Upchurch, Founder and CEO of Pink Stork

What to bring up with your provider

Mayo Clinic's guidance on supporting weight-loss medications with tailored nutrition notes that side effects like nausea and reduced appetite are usually most pronounced at the start of treatment or after a dose increase, and tend to improve with time. It's worth asking your provider specifically whether baseline or periodic labs for vitamin D, B12, and iron make sense for your situation, rather than assuming your usual multivitamin has it covered.

Frequently asked questions

What vitamins are most commonly low in people taking GLP-1 medications?

Vitamin D and thiamine (B1) are the most frequently reported, followed by other B vitamins and iron-related anemia, according to a large retrospective study of over 461,000 adults.

Why do GLP-1 medications affect nutrient levels?

These medications reduce appetite and slow gastric emptying, both of which can independently reduce overall food and nutrient intake, especially in people who already had elevated deficiency risk.

Should I take a multivitamin while on a GLP-1 medication?

That's a question for your prescriber or a registered dietitian, ideally alongside baseline labs, since needs vary by individual and by which nutrients your diet may already be lower in.

Can Nausea Sweets help with GLP-1-related nausea?

Nausea Sweets are formulated with active ginger or peppermint oil and vitamin B6 to help ease occasional upset stomach and digestive discomfort generally; they aren't formulated or marketed to address medication side effects directly.^†

How soon do nutrient deficiencies show up after starting a GLP-1 medication?

In the largest available study, deficiency diagnoses were already present in 12.7 percent of patients at 6 months, rising to over 22 percent by 12 months.

† These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.