# Creatine, Mass Gainers, GOMAD, and Weight-Gain Pills

**Claim:** Creatine monohydrate is the best-studied ergogenic aid for lifters and produces a small but real increase in lean body mass (~1 kg extra on top of resistance training) plus a ~1–2 kg acute rise in scale weight from intracellular water during loading.
- **Confidence:** C2
- **Sources:** https://pubmed.ncbi.nlm.nih.gov/28615996/ ; https://link.springer.com/article/10.1186/s12970-021-00412-w ; https://pmc.ncbi.nlm.nih.gov/articles/PMC155510/ ; https://www.tandfonline.com/doi/full/10.1080/15502783.2024.2380058
- **Date checked:** 2026-04-14
- **Cross-verified:** yes
- **Notes:** The ISSN position stand (Kreider et al. 2017) and the 2021 common-questions review (Antonio et al.) frame creatine monohydrate as the most-evidenced form, safe up to ~30 g/day long-term in healthy populations, with a typical maintenance dose of 3–5 g/day. A 2024 GRADE-assessed dose-response meta-analysis and earlier pooled analyses report ~1.0–1.1 kg additional lean mass vs. placebo when combined with resistance training, with males responding more than females. Loading (~20 g/day × 5–7 days) raises total body water by ~1–2 kg within a week; this water is largely intracellular and is mechanistically tied (osmotic swelling) to downstream hypertrophic signaling rather than being pure "bloat."

**Claim:** Commercial "mass gainer" shakes are mostly maltodextrin (fast carbohydrate) plus whey, typically delivering ~700–1,250 kcal per serving vs. ~100–150 kcal for plain whey; they are a convenience format, not a pharmacologically distinct product.
- **Confidence:** C2
- **Sources:** https://fortune.com/article/best-mass-gainer-supplements/ ; https://nakednutrition.com/blogs/protein/mass-gainer-vs-whey-protein ; https://barbend.com/mass-gainer-pros-cons/
- **Date checked:** 2026-04-14
- **Cross-verified:** yes
- **Notes:** Vendor and review roundups consistently describe mass gainers in the 700–1,200 kcal/serving range (some up to ~2,000 kcal, e.g. Serious Mass 1,250 kcal, Nutricost 1,220 kcal). The macro backbone is maltodextrin + whey ± casein, sometimes with added creatine/glutamine. Maltodextrin is nutritionally similar to glucose/sugar, so the calorie profile is essentially liquid carbs with a protein floor.

**Claim:** Mass gainers do not meaningfully outperform an equivalent whole-food surplus for muscle gain; their main advantages are convenience and palatability for people who struggle to eat enough, not a biological edge.
- **Confidence:** C3
- **Sources:** https://barbend.com/mass-gainer-pros-cons/ ; https://barbend.com/mass-gainer-vs-whey-protein/ ; https://pmc.ncbi.nlm.nih.gov/articles/PMC6710320/
- **Date checked:** 2026-04-14
- **Cross-verified:** no
- **Notes:** C3 because there is no head-to-head RCT of "mass gainer vs. isocaloric whole-food surplus" for hypertrophy that I could locate; the inference is built on (a) hypertrophy being driven by total energy/protein and training rather than source, per Slater 2019, and (b) RD/biochemist review consensus that mass gainers are functionally "liquid food" with added sugar. Downsides flagged in reviews: easy to overshoot into fat gain (liquid calories are poorly compensated for at later meals), lower satiety than whole foods, and added sugar load. Failed search terms: "mass gainer RCT vs whole food hypertrophy" and "liquid calories muscle gain trial."

**Claim:** GOMAD ("gallon of milk a day") is a bodybuilding folk tradition popularized by Mark Rippetoe's Starting Strength in the early 2000s, with roots going back to Peary Rader in the 1940s–50s and Bernarr McFadden in the 1920s.
- **Confidence:** C4
- **Sources:** https://physicalculturestudy.com/2017/01/16/the-history-of-the-gomad-diet/amp/ ; https://startingstrength.com/training/gaining_bodyweight_without_gomad ; https://startingstrength.com/video/gallon-of-milk-a-day-when-and-why
- **Date checked:** 2026-04-14
- **Cross-verified:** yes
- **Notes:** Rippetoe prescribed GOMAD as a brute-force add-on for underweight novices running Starting Strength, not as a general bulking tool. Historical tracing is via a fitness-historian blog (Physical Culture Study); tagged C4 because these are community/history sources rather than peer-reviewed. Later Starting Strength materials themselves walk it back and describe when GOMAD is and isn't appropriate.

**Claim:** A gallon of whole milk is roughly 2,400 kcal, ~128 g protein, ~128 g fat (including ~75 g saturated fat), and ~180 g sugar (lactose); realistic GOMAD results are rapid scale gains with substantial fat gain and frequent GI distress.
- **Confidence:** C3
- **Sources:** https://www.transparentlabs.com/blogs/all/gomad-diet ; https://www.healthline.com/health/food-nutrition/gomad-diet ; https://legionathletics.com/gomad-diet/
- **Date checked:** 2026-04-14
- **Cross-verified:** yes
- **Notes:** C3 because the macro totals are computed from standard whole-milk values (~150 kcal, ~8 g protein, ~8 g fat, ~12 g sugar per 240 mL cup × ~16 cups per US gallon). All three sources flag ~2,400 kcal/day from milk alone as well above most lifters' surplus needs, which is why GOMAD reliably adds weight but also reliably adds fat (commonly cited 2–3% body-fat increase over a GOMAD run). Downsides: saturated fat load (roughly 4x the US daily recommendation), lactose-driven bloating/diarrhea/nausea, dysbiosis concerns from sustained high-saturated-fat intake, and poor appetite for other foods.

**Claim:** OTC "weight-gainer pills" sold outside regulated pharmacies — especially cyproheptadine-containing products like Apetamin — are unapproved in the US and have been repeatedly flagged for adulteration with steroids (e.g., dexamethasone, prednisolone, betamethasone) and for serious adverse events including liver injury, cardiac events, and deaths.
- **Confidence:** C1
- **Sources:** https://www.fda.gov/consumers/apetamin-illegally-imported-weight-gain-figure-augmentation-product ; https://pmc.ncbi.nlm.nih.gov/articles/PMC11491866/ ; https://pubmed.ncbi.nlm.nih.gov/30825493/ ; https://www.cbp.gov/newsroom/local-media-release/baltimore-cbp-and-fda-seize-688k-shipment-apetamin-appetite
- **Date checked:** 2026-04-14
- **Cross-verified:** yes
- **Notes:** The FDA Apetamin consumer warning is C1 (primary regulatory source) and reports liver injury, cardiac and nervous-system events, and deaths in young adults; CBP has seized hundreds of thousands of dollars of shipments. A 2024 spectroscopic screening study of weight-gain products marketed in Yemen found dexamethasone and cyproheptadine adulteration, consistent with similar findings in DRC and other uncontrolled markets. A 2019 systematic review of cyproheptadine's appetite/weight-gain use finds modest short-term weight gain in pediatric and wasting populations at medically supervised doses, but sedation, anticholinergic effects, and abuse potential are the dominant concerns in the OTC figure-augmentation market.