Free Guide
Supplement Guide for GLP-1 Users
GLP-1 medications suppress appetite so effectively that nutritional deficiencies become nearly inevitable without intentional supplementation. This guide covers what the evidence supports — organized by who needs what.
Medical Disclaimer
This guide is for informational purposes only and does not constitute medical advice, diagnosis, or treatment. Supplement needs vary based on individual health status, medications, and lab values. Consult your physician or a registered dietitian before starting any supplement regimen — especially if you have kidney disease, thyroid conditions, are pregnant, or are taking prescription medications.
All GLP-1 Users
Universal Supplements
These apply regardless of sex. The appetite suppression and GI effects of GLP-1 medications create specific nutritional gaps that diet alone often cannot fill.
Protein Powder (Whey or Plant-Based)
Why it matters for GLP-1 users
GLP-1 medications suppress appetite so aggressively that protein intake frequently crashes below safe minimums. Clinical data shows 25–40% of weight lost without resistance training comes from muscle mass. Supplemental protein fills the gap when whole-food appetite is suppressed — a scoop of protein powder provides 20–30g with minimal volume.
Dosage Range
20–40g per serving; target 100–150g total daily protein from all sources
When to Take
Between meals, post-workout, or any time solid food feels difficult to eat
Vitamin B12
Why it matters for GLP-1 users
GLP-1 medications slow gastric motility and may reduce intrinsic factor secretion — both of which impair B12 absorption. B12 deficiency causes fatigue, peripheral neuropathy, and anemia that can masquerade as medication side effects. Higher doses and longer duration increase risk. Testing at baseline and annually is strongly recommended.
Dosage Range
500–2,000 mcg daily (methylcobalamin preferred over cyanocobalamin)
When to Take
Morning with breakfast; sublingual forms absorb better if absorption is impaired
Electrolytes & Magnesium
Why it matters for GLP-1 users
Reduced food intake directly reduces electrolyte intake. GI side effects — nausea, vomiting, diarrhea — cause further electrolyte loss. Low sodium, potassium, and magnesium cause muscle cramps, fatigue, brain fog, and headaches that many GLP-1 users incorrectly attribute to the medication itself. Correcting electrolytes often dramatically improves quality of life during titration.
Dosage Range
Sodium 500–1,500mg, Potassium 500–1,000mg, Magnesium 200–400mg daily
When to Take
Any time; with food to reduce GI irritation. Especially important on high-nausea days
Vitamin D
Why it matters for GLP-1 users
Vitamin D deficiency is already common (~40% of adults), and caloric restriction worsens it. Vitamin D is critical for muscle force production, immune function, and mood regulation — all under stress during active weight loss. Deficiency accelerates muscle loss and impairs recovery from resistance training. Getting levels tested is the highest-yield action most GLP-1 users can take.
Dosage Range
2,000–5,000 IU daily; target blood 25-OH vitamin D of 40–60 ng/mL
When to Take
With the largest or fattiest meal of the day — Vitamin D is fat-soluble
Omega-3 (Fish Oil / EPA + DHA)
Why it matters for GLP-1 users
Rapid weight loss generates a significant inflammatory response. Omega-3 fatty acids (EPA and DHA) are potently anti-inflammatory and support cardiovascular health during rapid fat loss — a period of heightened cardiac stress. Also supports joint health and may reduce delayed-onset muscle soreness from resistance training, helping GLP users stay consistent with exercise.
Dosage Range
2–4g combined EPA + DHA daily (check the label — total fish oil dose is higher than EPA+DHA content)
When to Take
With meals to minimize fishy aftertaste; split into two doses if taking 4g daily
Creatine Monohydrate
Why it matters for GLP-1 users
Creatine monohydrate is the most rigorously studied supplement for muscle preservation and strength. It increases phosphocreatine stores in muscle, enabling greater training intensity and volume — directly countering GLP-driven muscle loss. Meta-analyses consistently show creatine preserves lean mass during caloric restriction. Emerging research also suggests cognitive benefits, relevant during the brain-fog many GLP-1 users report.
Dosage Range
3–5g daily (no loading phase necessary)
When to Take
Any time consistently — timing relative to workouts shows minimal difference in outcomes
Men
Men's Supplements
Men face specific hormonal pressures during GLP-1-mediated weight loss. Caloric restriction and rapid fat loss suppress testosterone — these supplements address that directly.
Zinc
Why it matters for GLP-1 users
Testosterone production depends on adequate zinc. Caloric restriction and significant weight loss are consistently associated with reduced serum zinc and reduced testosterone. Testosterone decline accelerates muscle loss and impairs recovery — a compounding risk for men on GLP-1s. Zinc also supports immune function, protein synthesis, and wound healing, all relevant during active weight loss.
Dosage Range
15–30mg elemental zinc daily (zinc picolinate or bisglycinate for best absorption)
When to Take
With food to reduce nausea; do not take simultaneously with iron supplements (compete for absorption)
Magnesium Glycinate
Why it matters for GLP-1 users
Magnesium supports testosterone synthesis, sleep quality, and muscle recovery through multiple pathways. The glycinate chelate form is the most bioavailable and gentlest on the GI tract — critical for men already managing nausea and GI symptoms. Caloric restriction raises cortisol, which suppresses testosterone; magnesium directly moderates the cortisol response. Sleep optimization on magnesium glycinate further supports recovery and hormone production.
Dosage Range
300–400mg elemental magnesium as glycinate daily
When to Take
30–60 minutes before bed for maximum sleep and recovery benefit
Ashwagandha (KSM-66 or Sensoril Extract)
Why it matters for GLP-1 users
Sustained caloric restriction chronically elevates cortisol, which suppresses testosterone and directly impairs muscle protein synthesis. KSM-66 ashwagandha extract has clinical evidence for reducing cortisol by 14–32% and modestly increasing testosterone in men under physiological stress. Secondary benefits include improved sleep quality, reduced anxiety, and faster exercise recovery — all directly relevant to men on GLP-1 medications.
Dosage Range
300–600mg of standardized KSM-66 or Sensoril extract daily
When to Take
With meals; evening dosing if using primarily for sleep
Women
Women's Supplements
Women have distinct needs: higher iron requirements, bone density considerations, reproductive health factors, and a higher prevalence of PCOS among GLP-1 users.
Iron
Why it matters for GLP-1 users
Women have higher baseline iron requirements than men, and GLP-1 medications reduce both food volume and gastric acid — both of which impair iron absorption. Iron deficiency (even before clinical anemia) causes fatigue, hair thinning, impaired cognitive function, and reduced exercise tolerance. These symptoms are extremely common in women on GLP-1s and are frequently undertreated. Ferritin testing is the most important lab for women on these medications.
Dosage Range
18mg daily (RDA); 45–60mg if deficient (only under physician guidance)
When to Take
On an empty stomach for best absorption; take with vitamin C (250mg) to enhance absorption by up to 67%
Calcium + Vitamin D
Why it matters for GLP-1 users
Rapid weight loss accelerates bone resorption. Women already face age-related and hormonal bone density loss; GLP-1-driven rapid fat loss adds meaningful additional stress on skeletal health. Calcium and Vitamin D work synergistically — Vitamin D is required for calcium absorption. Women losing weight rapidly on GLP medications should treat bone health as a serious long-term priority.
Dosage Range
500–600mg calcium per dose, twice daily (absorption limited per dose); 2,000–5,000 IU Vitamin D daily
When to Take
Calcium with meals; Vitamin D with the fattiest meal of the day. Split calcium into two doses — the body cannot absorb more than ~600mg at once
Folate (Methylfolate / B9)
Why it matters for GLP-1 users
Folate is critical for women of childbearing age — deficiency causes neural tube defects. GLP-1 medications may impair folate absorption through altered GI function. Separately, methylfolate supports methylation, mood, cognitive function, and cardiovascular health. Approximately 40% of people carry MTHFR variants that impair conversion of folic acid to its active form — making methylfolate the superior choice for most women.
Dosage Range
400–800 mcg methylfolate (5-MTHF) daily; women actively trying to conceive should use 800 mcg starting 1–3 months before conception
When to Take
With breakfast or any main meal
Collagen Peptides
Why it matters for GLP-1 users
Rapid weight loss causes skin to lose elasticity faster than it can adapt — loose skin is one of the most common aesthetic concerns for women on GLP-1 medications. Hydrolyzed collagen peptides (Types I and III) with adequate Vitamin C have clinical evidence for improving skin elasticity and reducing the appearance of loose skin during weight loss. Collagen also supports joint health, relevant for women increasing exercise intensity.
Dosage Range
10–20g hydrolyzed collagen peptides daily
When to Take
Morning or post-workout with a Vitamin C source (50–250mg) — Vitamin C is a required cofactor for collagen synthesis
Myo-Inositol
Why it matters for GLP-1 users
A significant proportion of women prescribed GLP-1 medications have PCOS (polycystic ovary syndrome). Myo-inositol is a naturally occurring compound with strong clinical evidence for improving insulin sensitivity, regulating menstrual cycles, and reducing androgen excess in PCOS — effects that directly complement GLP-1 mechanisms. Even women without PCOS benefit from inositol's insulin sensitizing effects during caloric restriction.
Dosage Range
2–4g myo-inositol daily; for PCOS, a 40:1 ratio of myo-inositol to D-chiro-inositol is often recommended
When to Take
Split into two doses with meals
The Labs Worth Requesting
Rather than supplementing blindly, these baseline labs give you a clear picture of where you actually stand. Ask your doctor to order them at your next visit — most are covered by insurance for patients on GLP-1 medications.
Track Your Nutrition & Progress
GLPMAXX Premium includes a GLP-specific macro calculator that accounts for your current medication, weight, and goals — helping you hit protein and calorie targets even with suppressed appetite. Pair your supplement stack with a nutrition plan built for GLP-1 users.