Raw Milk vs Pasteurized Milk — What the Science Actually Says

What Is Pasteurization?

Pasteurization is the process of heating milk to a specific temperature for a specific time to kill pathogenic microorganisms without significantly altering the nutritional composition. It was developed by Louis Pasteur in 1864 following his work on germ theory — specifically demonstrating that fermentation and spoilage were caused by specific microorganisms, not spontaneous generation.

The Three Main Methods

Method	Temperature	Time	Common Use
HTST (High Temperature Short Time)	72°C	15 seconds	Standard commercial milk, most packaged milk in India
UHT (Ultra-High Temperature)	135–150°C	2–5 seconds	Long-life tetrapak milk, shelf-stable product
LTLT (Low Temperature Long Time)	63°C	30 minutes	Artisan / vat pasteurization, some specialty dairies

HTST is the most common and the gentlest — a brief exposure that kills pathogens while minimising thermal degradation. UHT is more aggressive and creates the characteristic ‘cooked’ flavour of long-life milk; it also reduces more nutrients. LTLT (vat pasteurization) is used by some artisan producers and is considered to preserve flavour better than HTST.

What pasteurization is not: sterilisation. Pasteurized milk still contains many non-pathogenic bacteria and has a limited shelf life (typically 5–21 days under refrigeration for HTST).

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The Claims for Raw Milk — Real vs Myth

Raw milk advocates make several claims. It is worth examining each against the evidence.

Claim 1: ‘Raw milk has more nutrients’

Partially true, but the difference is marginal.

Pasteurization (HTST, 72°C/15 sec) causes:

• Vitamin B1 (thiamine): 3–20% reduction
• Vitamin B6: 0–8% reduction
• Vitamin C: 10–25% reduction — but milk is not a significant vitamin C source; a single orange has 25× more vitamin C than a glass of milk

What is fully preserved through pasteurization:

• All protein (casein, whey) — heat denaturation of whey begins above 70°C but is minimal at HTST temperatures
• Calcium — 100% retained
• All fat and fat-soluble vitamins (A, D, E, K) — completely stable
• All B12 — heat stable at HTST temperatures
• Riboflavin (B2) — fully retained
• All minerals — not affected by heat

The reality: the nutritional difference between fresh raw milk and HTST-pasteurized milk is nutritionally trivial. If the comparison is raw milk vs UHT milk, the differences are slightly larger — but UHT milk is still a nutritionally valuable food.

Claim 2: ‘Raw milk has beneficial enzymes’

True — but those enzymes do not survive your stomach anyway.

Raw milk contains alkaline phosphatase, lactoperoxidase, lysozyme, and lipase. Alkaline phosphatase is specifically used as a marker to test whether pasteurization was effective — if phosphatase activity is absent, pasteurization was complete.

However, these enzymes are digestive proteins. When you drink milk, the acidic environment of the stomach (pH ~2) denatures and inactivates these enzymes within minutes — exactly as it inactivates any dietary protein. The enzymes in raw milk do not survive to provide systemic benefit.

Lactoperoxidase and lysozyme do have antimicrobial activity in the raw milk itself (they are part of the cow’s innate immune defence), which is one reason raw milk does not spoil as instantly as distilled water. This antibacterial activity is destroyed by pasteurization — but it is also irrelevant once you have consumed the milk.

Claim 3: ‘Raw milk has probiotics’

Mostly false for fresh raw milk; partially true for raw fermented dairy.

Fresh raw milk is not a meaningful source of probiotic lactic acid bacteria. Probiotic cultures (Lactobacillus, Bifidobacterium) are present in fermented dairy — curd, yogurt, kefir — where bacterial numbers are in the billions per gram. Fresh raw milk contains some bacteria, but not primarily the beneficial strains, and not at therapeutic concentrations.

The probiotics in A2 curd and buttermilk come from the fermentation process, not from the raw milk base. A2 pasteurized milk can be fermented to produce probiotic curd just as effectively as raw A2 milk.

Claim 4: ‘Raw milk tastes better’

Often subjectively true — but it is not a nutritional argument.

Raw milk, especially from pasture-fed cows, has a richer, creamier flavour profile than homogenised UHT milk. This is real. But this is a quality/freshness argument, not a safety or nutrition argument. HTST-pasteurized fresh A2 milk from the same farm retains most of this flavour. The ‘raw milk tastes better’ argument is largely an argument against UHT homogenised commercial milk — not against gentle pasteurization.

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The Real Risk: What Grows in Raw Milk

This is the part that raw milk advocates systematically understate.

Raw milk can harbour:

Pathogen	Disease caused	Severity
Listeria monocytogenes	Listeriosis	High fatality in pregnant women, newborns, elderly — 20–30% case fatality rate
E. coli O157:H7	Haemolytic uraemic syndrome (HUS)	Can cause kidney failure and death, particularly in children
Salmonella spp.	Salmonellosis	Severe gastroenteritis; dangerous in immunocompromised individuals
Campylobacter jejuni	Campylobacteriosis	Most common cause of bacterial diarrhoea globally
Brucella spp.	Brucellosis	Chronic debilitating illness; difficult to treat
Mycobacterium bovis	Bovine tuberculosis	Rare but serious; pasteurization eliminated this as a dairy-borne disease

These are not theoretical concerns. The US Centers for Disease Control (CDC) has tracked dairy-related outbreaks for decades. Their published data shows that from 1998–2018, raw milk was responsible for 840 times more illness-causing incidents per unit sold than pasteurized milk. Approximately 95% of all dairy-borne illness outbreaks in the US are linked to raw or improperly pasteurized dairy.

These pathogens are present even in milk from healthy-appearing cows on clean farms. A cow can shed Campylobacter or Listeria without showing any signs of illness. Visual inspection of the farm, the animal, or the milk cannot distinguish safe raw milk from dangerous raw milk.

Who Should Never Drink Raw Milk

The risk is not equally distributed:

• Pregnant women — Listeria crosses the placental barrier and causes miscarriage, stillbirth, or severe neonatal illness
• Children under 5 — E. coli O157:H7 causes haemolytic uraemic syndrome most severely in young children; can cause permanent kidney damage or death
• Adults over 65 — Reduced immune function; higher fatality from all foodborne pathogens
• Immunocompromised individuals — Anyone on immunosuppressive drugs, chemotherapy, HIV-positive, or with organ transplants

For healthy adults, the risk is lower but not zero. The question is: what benefit are you gaining that justifies accepting a risk that is 840× higher than the alternative?

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India Context: Most ‘Fresh’ Milk Is Technically Raw

This is important and often overlooked in the raw milk debate.

Most milk sold by local dairies in Indian cities and towns — the ‘gawaala milk’, the local dairy packets, the fresh milk delivered in the morning — has not been pasteurized. It is technically raw milk that has been chilled or kept cool during transport. If you want to verify what is in your milk before consuming it, see the guide on how to test milk purity at home.

But Indian households almost universally boil their milk before consuming it. This single practice — boiling milk at home — is India’s de facto pasteurization system. It has been standard practice for generations, and it works.

Home boiling (95–100°C for 2–5 minutes) kills all the pathogens listed above. The nutritional losses are comparable to HTST pasteurization — slightly higher due to longer exposure time, but not dramatically different.

The Indian milk safety situation is therefore:

• Local fresh (raw) milk + home boiling = effectively safe
• Packaged pasteurized milk (HTST) = safe without boiling
• Raw milk consumed directly without boiling = genuine risk

The practice of drinking raw milk directly — without boiling — is far less common in India than in Western raw milk advocate communities, which is likely one reason large-scale raw milk disease outbreaks are less frequently documented in India than in the US or Europe (where raw milk consumption is ideological and deliberately unboiled).

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Does Boiling Destroy Nutrients?

This is a common concern in Indian households. The evidence:

• Protein: Minor denaturation of whey protein at 100°C — does not affect nutritional value or amino acid availability
• Calcium: Not affected by heat
• Fat and fat-soluble vitamins (A, D, E, K): Fully stable through boiling
• Vitamin B12: Stable; minimal loss
• Vitamin B1, B6: 5–20% loss — similar to HTST pasteurization
• Vitamin C: 25–30% reduction — but milk is not a significant C source regardless

Conclusion: Home boiling causes nutritional losses that are modest and largely comparable to pasteurization. The safety benefit (pathogen elimination) overwhelmingly outweighs this nutritional tradeoff. There is no nutritional case for drinking unboiled raw milk in India.

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A2 Raw Milk Specifically

A frequently asked question: does pasteurizing A2 milk destroy the A2 benefit?

No. Definitively not.

The A2 benefit comes from the genetic variant of beta-casein protein — specifically, the presence of proline at position 67 of the beta-casein chain instead of histidine. This is a genetic characteristic of the amino acid sequence.

Pasteurization heats milk to 72°C (HTST) or 100°C (home boiling). Protein denaturation (unfolding of the tertiary structure) begins to occur, but the primary structure — the amino acid sequence — is not altered by heat. Proline at position 67 remains proline. The A2 protein does not become A1 protein through heating.

The research that showed BCM-7 is released from A1 casein (not A2) was conducted using standard enzymatic digestion conditions — conditions that apply regardless of whether the milk was raw or pasteurized. Pasteurized or home-boiled A2 milk produces no more BCM-7 than raw A2 milk.

This means: all the A2 benefits (no BCM-7 release, better digestibility for sensitive individuals, no A1-related inflammatory response) are fully preserved in pasteurized A2 milk.

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The Bottom Line

Pasteurized (or home-boiled) A2 milk from desi cows gives you every benefit that raw A2 milk proponents claim — the A2 protein advantage, the full nutritional profile, the superior digestibility — with zero additional pathogen risk. The only things you lose in pasteurization are marginal amounts of heat-sensitive vitamins that are readily available from other foods, and enzymes that your stomach would denature immediately anyway.

Raw milk is an unnecessary risk given India’s dairy supply chain conditions. Even on clean farms, pathogen contamination cannot be detected visually or by smell. The 840× higher illness rate from raw milk consumption versus pasteurized is a figure derived from real outbreak data — not a theoretical model.

For consumers who want the most from their dairy: Choose pasteurized (or home-boiled) A2 milk from verified desi cow breeds. You get the A2 benefit. You get the nutrition. You don’t get the pathogens.

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Raw Milk vs Pasteurized vs UHT vs Home-Boiled

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Frequently Asked Questions

Q

Is raw milk really more nutritious than pasteurized?

A

Marginally, in a few specific nutrients. HTST pasteurization (72°C/15 sec) causes minor reductions in vitamin B1 and B6 (3–20%) and some enzymes. All protein, calcium, fat, vitamins A/D/E/K, and B12 are fully preserved. The practical nutritional difference is trivial — you would not choose to consume a pathogen-laden food to obtain a 10% more thiamine. The marginal nutrient gap is easily covered by any varied diet.

Q

Does boiling milk at home destroy its nutrition?

A

Not significantly. Home boiling causes nutritional losses comparable to pasteurization — mainly minor reductions in heat-sensitive B vitamins. Calcium, protein quality, fat-soluble vitamins, and B12 are not meaningfully affected. Indian households have boiled milk for generations without nutritional deficit. The safety benefit of boiling far outweighs the minor vitamin losses, particularly given India's raw milk supply chain.

Q

What about A2 raw milk — is it worth drinking raw?

A

No. The A2 benefit — the absence of BCM-7 release during digestion — is entirely preserved through pasteurization and home boiling. The A2 protein structure (proline at position 67 of beta-casein) is a genetic amino acid sequence characteristic; heat does not convert A2 to A1. Pasteurized or boiled A2 milk gives you identical A2 protein benefits with none of the pathogen risk of raw milk. There is no nutritional justification for drinking A2 milk raw.

Q

Is raw milk legal in India?

A

The Food Safety and Standards Authority of India (FSSAI) requires that milk sold commercially must be pasteurized. Raw milk is not legally permitted for direct retail sale. However, enforcement is limited, and raw milk is widely sold through local dairies, gawaale (milk vendors), and farm-direct arrangements. Consuming raw milk from these sources is the individual's choice, but it is technically non-compliant with FSSAI regulations and carries the pathogen risks described above. Home boiling of raw milk is the standard and effective mitigation practice.

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Related Articles

• A2 Desi Cow Milk — Complete Guide
• How to Test Milk Purity at Home
• A1 vs A2 Milk — The Complete Science

Last updated: March 2026