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As someone who's neither a doctor nor a food scientist, but a passionate reader and wellness enthusiast, I’ve come to discover something truly special through my research—Koji Amazake. Often called "a drinkable IV" in Japan, this traditional fermented rice drink has captivated my attention not only with its natural sweetness but also with its extraordinary health benefits.
There are actually two main types of amazake: Koji Amazake, made from rice and rice koji, and Sake Lees Amazake, made from the by-product of sake brewing. While both are called “amazake,” they’re quite different. Koji Amazake is naturally sweet, alcohol-free, and doesn't require added sugar. In contrast, Sake Lees Amazake often contains added sugar and small amounts of alcohol. For those looking for a health-conscious option—especially children, pregnant women, or anyone avoiding alcohol—Koji Amazake is the clear choice.
After diving deep into multiple books and studies, I’ve become convinced that Koji Amazake deserves a spot in your daily routine. Below, I’ve compiled 17 science-supported and time-tested health benefits of Koji Amazake that might surprise you—and perhaps inspire you to give it a try.
Rich in natural glucose and amino acids, Koji Amazake provides quick energy that your body can absorb immediately—perfect for mornings or an afternoon slump.
With over 350 nutrients, including oligosaccharides and enzymes, Koji Amazake supports gut health—home to 70% of our immune cells.
Fermentation creates enzymes and probiotics that balance your gut flora, aiding digestion and reducing bloating.
Koji Amazake contains ceramides, amino acids, and antioxidants like ferulic acid and ergothioneine—supporting skin hydration and reducing signs of aging.
It reduces cravings by stabilizing blood sugar and contains peptides that help regulate fat absorption and metabolism.
ACE-inhibitory peptides found in Koji help lower blood pressure—particularly valuable for those concerned with hypertension.
Prolamins, a resistant protein found in Koji Amazake, may help lower LDL cholesterol and improve lipid profiles.
Both soluble and insoluble fiber promote regularity and support colon health.
With nutrients that support liver function and reduce acetaldehyde (a toxin from alcohol), it’s great before or after drinking.
Powerful antioxidants help slow aging at the cellular level and reduce oxidative stress.
Thanks to B vitamins and fast-absorbing glucose, it supports brain health and mental focus.
The B-complex vitamins and fermented nutrients may assist in hormone regulation and menstrual comfort.
Historically consumed in Japanese summers, Koji Amazake helps restore energy and electrolytes.
Reported to enhance blood flow, contributing to warmer extremities and healthier skin tone.
Rich in folate and B vitamins, it supports fetal development and healthy pregnancy outcomes.
Fermented rice and dietary fiber components may help reduce colon cancer risks through improved gut health.
Its mild, naturally sweet flavor makes it a smart substitute for sugar in drinks, dressings, or desserts.
I’m not claiming to be an expert—I’m just someone who cares deeply about health and wellness, and who wants to share the incredible discoveries I’ve made about Koji Amazake. Everything I’ve written is based on reputable books, traditional wisdom, and current scientific insights into fermentation and nutrition. I encourage you to explore, consult, and—most of all—try it for yourself.
Koji Amazake is more than a drink—it’s a centuries-old superfood that blends tradition with modern wellness. Whether you sip it warm on a cold morning or use it to sweeten your favorite recipes, it might just become your new health ritual.
Start small, stay curious, and let nature’s fermentation magic work its wonders.
This article was inspired by the book:『砂糖の代わりに糀甘酒を使う』 by Kenji Maebashi and Yoko Amako (Ascom Publishing, 2020)Their insights into the role of Koji Amazake as a natural sweetener and health tonic helped shape much of the understanding presented here.
