Air-Dried vs Freeze-Dried vs Raw

The short answer: these three get lumped together as the "natural" end of the aisle, and they do share a philosophy, but they split on the thing that matters most, which is food safety. The dividing line is heat: raw and freeze-dried are uncooked, air-dried is gently heated.

• Raw carries the highest bacterial risk; freeze-dried is still raw.
• Air-dried is gently heated, so its safety profile is different from the uncooked two.
• All three keep more nutrients than kibble.
• Raw needs a freezer; freeze-dried and air-dried are shelf-stable.

Raw is uncooked meat, organ and bone, usually sold frozen or chilled. Freeze-dried is also raw: the food is frozen, then put under vacuum so the ice turns straight to vapour, removing the water without heat, which leaves it shelf-stable but still uncooked. Air-dried is gently heated: warm air slowly draws the moisture out over many hours, so it is shelf-stable and uses far less heat than kibble, but unlike the other two it is not uncooked.

This is where they genuinely separate. UK Food Standards Agency testing of raw pet food sold across the UK found that around 35% of products sampled contained harmful bacteria such as Salmonella, Campylobacter and E. coli (Food Standards Agency). The British Veterinary Association does not recommend raw meat-based diets, citing that risk of contamination, and notes that because the food is not cooked, any bacteria present are not killed off (BVA). That same logic applies to freeze-dried, because freeze-drying removes water without cooking, so it does not make the food pathogen-free; some brands add a high-pressure step to reduce bacteria, but the product is still raw. (The US CDC makes the same mechanistic point plainly, that freezing, dehydrating and freeze-drying only reduce germs rather than kill them, which is why it is worth citing here.) Air-dried food is gently heated, so it has a better safety profile than the uncooked options, though it is still less heavily heat-treated than kibble. Vets flag particular risk for homes with young children, elderly or pregnant people, or anyone immunocompromised.

All three retain more than kibble, because none use kibble's high heat. Freeze-dried arguably retains the most, as it uses no heat at all; air-dried retains a great deal at low heat; raw retains everything, with the safety trade-off above. So the honest framing is not "which is most nutritious" in isolation, but how you want to balance nutrition against safety and convenience.

Raw needs freezer space, careful handling and thawing. Freeze-dried and air-dried are both shelf-stable and need no fridge, a real practical win. On price, freeze-dried is usually the most expensive because the process is slow and costly, raw varies, and air-dried sits in the middle.

If absolute nutrient retention is the priority and you are comfortable with raw-handling hygiene, freeze-dried gives you that in a shelf-stable form. If you want most of the benefit of minimally processed food without handling uncooked meat, gently heated air-dried is the easier middle ground. And if anyone in your home is very young, elderly, pregnant or immunocompromised, the safety case points away from raw and uncooked freeze-dried.

SMPL is deliberately on the gently-heated side: air-dried below 60°C, nutrient-dense and shelf-stable, with twelve named ingredients. Whichever way you lean, the most useful habit is the same, which is to pick a brand that can tell you exactly how it keeps its food safe.