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Medium Roast Cold Brew — Less Acidic Than Hot Coffee, But Is It Actually Low Acid?
Medium Roast Cold Brew — Why Your Bean Matters More Than Your Brew Method
Cold brew has exploded in popularity — and for good reason. The cold extraction process naturally reduces some acid compared to hot brewing. But here's what most cold brew drinkers don't know: the primary driver of acidity in your cold brew is the roasting of the bean, not the brew method. Start with a high acid bean and you'll still end up with a high acid cold brew — just marginally less so.
If you want genuinely low acid cold brew, the solution starts before water ever touches the coffee. It starts with how the bean was roasted.
5X
Less acid than average commercial coffee
pH 5.82
Puroast — confirmed by UC Davis
5X
More antioxidants than average commercial coffee
The Cold Brew Acid Myth: Cold brew is marketed as "naturally lower acid" — and while cold extraction does reduce some surface acids, it does not eliminate the roasting-derived quinic acids that cause the most gut irritation. Puroast cold brew starts at a fundamentally lower acid baseline because those quinic acids were converted to antioxidants during roasting — before the water ever touches the bean.
⭐ Best for Cold Brew
Ugandan Single Origin
Puroast's most select bean. Rich, complex cold brew — 5X less acid. UC Davis confirmed.
Shop Uganda →
Classic Medium Roast
House Blend 2.5lb
Smooth, everyday cold brew with 5X less acid and 5X more antioxidants. Perfect base.
Shop House Blend →
Rich & Complex
Mocha Java 2.5lb
Deep, chocolatey cold brew notes — low acid, high antioxidant, gut-friendly.
Shop Mocha Java →
Why Medium Roast Is Ideal for Cold Brew
Medium roast hits the sweet spot for cold brew. Light roasts can taste grassy or under-extracted in cold water — the low temperature struggles to pull the full flavor from a lightly developed bean. Dark roasts can taste bitter and harsh when concentrated in a cold brew format. Medium roast delivers full, developed flavor with natural sweetness and balanced body — exactly what cold brew needs to shine.
When you combine a true medium roast with Puroast's patented low acid roasting process, you get cold brew that is smooth, flavorful, and genuinely low acid from the first sip. Puroast's Ugandan Single Origin is the standout choice — its naturally complex, layered flavor profile becomes even more expressive in cold brew, with chocolate, fruit, and earth notes that emerge slowly over the long steep.
How to Make the Best Low Acid Cold Brew at Home
Cold brew is simple, but ratios and timing matter:
- Bean selection: Start with Puroast House Blend, Ugandan Single Origin, or Mocha Java for maximum flavor and minimum acid.
- Grind: Coarse — similar to raw sugar. Too fine produces bitter, over-extracted results.
- Ratio: 1 cup coarsely ground Puroast to 4 cups cold filtered water.
- Steep time: 12–24 hours in the refrigerator. 16–18 hours is the sweet spot for medium roast.
- Filter: Strain through fine mesh or cheesecloth. Discard grounds.
- Serve: Over ice, straight or diluted 1:1 with water or milk of choice.
- Store: Refrigerate for up to 2 weeks.
The Science: Why Cold Brew Alone Doesn't Solve the Acid Problem
Cold water extraction naturally produces fewer chlorogenic acid breakdown products than hot extraction. This is why cold brew tends to taste smoother and less bitter than drip coffee — fewer surface acids are extracted at lower temperatures. However, the quinic acids that cause the most significant gut irritation are roasting-derived, meaning they are chemically bonded into the bean structure during flash roasting and are extracted regardless of brew temperature.
UC Davis researcher Dr. Takayuki Shibamoto confirmed in a peer-reviewed 2009 study that Puroast's patented slow-roasting process converts those quinic acids into phenolic antioxidant compounds before brewing begins. This means Puroast cold brew starts at a fundamentally different acid baseline — not just marginally lower like conventional cold brew, but genuinely 5X less acidic across the board.
The LACCSA framework confirms that roasting chemistry, not brew method, is the primary determinant of coffee's final acid content.
Uganda Single Origin Cold Brew — The Premium Experience
Puroast's Ugandan Single Origin is the most select and highest quality bean in the Puroast lineup — and in cold brew, it reaches its full potential. Uganda's high-altitude volcanic growing conditions produce beans with exceptional natural complexity: notes of dark chocolate, stone fruit, and subtle earthiness that develop beautifully over a long cold steep. At pH 5.82 — 5X less acid than conventional cold brew beans — it delivers a cold brew that is both premium in flavor and genuinely gut-friendly.
Cold Brew and GLP-1 Medications
Cold brew has become a popular choice for GLP-1 medication patients because of its reputation for being easier on the stomach. But if that cold brew is made from conventionally roasted beans at pH 4.5–5.1, the acid load remains significant despite the cold extraction. For GLP-1 patients, Puroast cold brew — made from beans already at pH 5.82 before brewing — represents the genuinely gentlest coffee format available. Consult your healthcare provider before making dietary changes while on GLP-1 medications.
Frequently Asked Questions
Is cold brew less acidic than hot coffee?
Cold brew does extract fewer surface acids than hot brewing. But the biggest driver of coffee acidity — roasting-derived quinic acids — is present regardless of brew temperature. Puroast cold brew addresses both: patented roasting eliminates quinic acids before brewing, and cold extraction reduces surface acids. The result is the lowest acid cold brew available.
What roast is best for cold brew?
Medium roast is ideal for cold brew — it delivers full flavor and natural sweetness without dark roast bitterness or light roast grassiness. Puroast House Blend, Ugandan Single Origin, and Mocha Java are all excellent cold brew choices, each bringing a distinct flavor profile at the same low acid baseline.
How long should I steep Puroast cold brew?
16–18 hours at refrigerator temperature is the sweet spot for medium roast. Shorter steeps (12 hours) produce a lighter brew; longer steeps (24 hours) create a stronger concentrate ideal for diluting with milk or water.
Which Puroast bean makes the best cold brew?
Puroast Ugandan Single Origin is the standout cold brew choice — its natural flavor complexity (chocolate, stone fruit, earth) develops beautifully over a long cold steep. House Blend is the everyday workhorse for smooth, clean cold brew. Mocha Java adds deep richness and a chocolate character that makes exceptional cold brew concentrate.
Can I use Puroast ground coffee for cold brew?
Yes — Puroast ground coffee works well for cold brew when ground coarse. For maximum freshness and control over grind size, whole bean ground at home immediately before brewing is ideal. Both formats produce excellent results.
Sources: Shibamoto et al., Journal of Agricultural and Food Chemistry (2009) — doi:10.1021/jf900620n; NC A&T State University Low Acid Coffee Study (2024); American Chemical Society Presentation, Dr. Takayuki Shibamoto (2013); LACCSA Low Acid Coffee Consumer Safety Advocacy Framework.
Medical Disclaimer: This article is for informational purposes only and does not constitute medical advice. If you have acid reflux, GERD, or any gastrointestinal condition, consult a qualified healthcare provider before making dietary changes.
