Dymatize ISO100 is milk-derived but low in lactose — most intolerant people handle it fine, though milk allergy means skip it entirely.
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Download Ryla — Free on the App StoreDymatize ISO100 is 83% protein by weight. Every gram comes from milk. If you have lactose intolerance, that sounds like bad news. But whey isolate is not the same as a glass of milk. The label tells a different story.
Dymatize ISO100 has milk as a declared allergen. It is not dairy free. The product uses hydrolyzed whey protein isolate, which goes through two rounds of processing: microfiltration strips out fat and most lactose, then enzymatic hydrolysis breaks the remaining protein into shorter peptide chains. Each serving has under 1g of sugar. Those with a true milk allergy (IgE-mediated) must avoid it entirely.
The main ingredient is hydrolyzed whey protein isolate. It makes up about 58% of the product. Whey is the liquid left after milk curdles during cheese making. Dymatize breaks it down further through hydrolysis. This splits large milk proteins into smaller pieces. The label lists milk and soybeans as allergens. Soy lecithin likely serves as an emulsifier in the blend. Even after hydrolysis, milk proteins remain. They are just in shorter chains. The 83.3g of protein per 100g confirms whey is the bulk of this product.
No "may contain" trace warnings appear on the ISO100 label. This is rare for a protein powder. Many brands warn about shared lines with egg, peanut, or tree nuts. ISO100 skips those warnings. The dairy here is not a trace contaminant. It is the product itself. Soy is also present by formula, not by shared lines. If you avoid just one allergen and it is not milk or soy, the label is clean for you.
Serving size is one scoop at 30g. The pack holds 610g, which gives about 20 servings per tub. Zero fat stands out for a protein source. Each 30g scoop gives roughly 25g of protein. Sugars sit at 3.3g per 100g. Nutri-Score rates it grade B for good quality. NOVA Group 4 marks it as ultra-processed, meaning it contains ingredients you would not find in a home kitchen, like soy lecithin and artificial flavoring agents.
Milk allergy and lactose intolerance are two different conditions. Milk allergy is an immune response to casein or whey proteins. The body produces IgE antibodies that trigger symptoms ranging from hives to anaphylaxis. Lactose intolerance is a gut issue caused by low lactase enzyme production, leading to bloating and cramping. ISO100 has milk proteins in every scoop. For milk allergy, this product is not safe. Hydrolysis breaks proteins into peptides of 3,000-10,000 daltons, but the immune system can still recognize fragments as small as 3,000 daltons. Do not rely on hydrolysis to prevent an allergic reaction.
For lactose intolerance, whey isolate filtration strips most lactose out. The 3.3g sugar per 100g includes all sugars, not just lactose. Actual lactose content in whey isolate typically falls between 0.5% and 1% by weight. Per 30g scoop, that works out to 0.15-0.3g of lactose, well below the 12g threshold where most intolerant people begin to feel symptoms. Start with half a scoop to test your response. If you need a fully dairy-free protein, pea, rice, or hemp blends use no milk at any stage of production.
| HYDROLYZED WHEY PROTEIN ISOLATE | Flagged |
| WHEY PROTEIN ISOLATE | Flagged |
| LESS THAN 2% OF: NATURAL AND ARTIFICIAL FLAVORS | Observed |
| SALT | Observed |
| SOY LECITHIN | Flagged |
| SUCRALOSE | Observed |
| STEVIOL GLYCOSIDES (STEVIA) | Observed |
Most people with lactose intolerance can handle whey isolate. The threshold varies by person. Some tolerate up to 12g of lactose per sitting with mild symptoms. A 30g scoop of whey isolate has far less lactose than a glass of milk, which holds about 12g.
Take whey isolate with food to slow digestion. This gives your gut more time to process any trace lactose. Some users also take a lactase enzyme pill with their shake for extra comfort.
No whey product is fully lactose free. Whey isolate has about 0.5-1% lactose by weight after filtration. Whey concentrate has 5-6%. That gap is why isolate works for most intolerant people but concentrate often does not.
Regular whey concentrate has much more lactose than isolate. A typical concentrate is 5-6% lactose by weight. A 30g scoop of concentrate could have 1.5-1.8g of lactose. Isolate cuts that by 80% or more through extra filtration steps.
Some brands add lactase enzyme right into their whey formula. This breaks down any leftover lactose in the powder before you drink it. If even whey isolate causes symptoms, a plant-based protein from pea, rice, or hemp has zero lactose by nature.