Not all plant protein powders are created equal. A "clean" protein goes beyond grams of protein: it's about ingredient quality, sourcing, digestibility and proof that what's on the label is what's in the tub. This guide covers what to look for, how pea and rice protein compare, how to read a label, and which certifications are worth understanding.
What makes a protein powder "clean"?
"Clean" isn't a regulated term, so it helps to break it into things you can check.
Plant-based protein sources
Pea, rice and other plant proteins are dairy-free, which matters because about 36% of people in the US have lactose malabsorption. Well-made plant proteins are also highly digestible: in a randomized trial, pea protein's digestibility was similar to casein's, and it met all essential amino acid requirements on its own.
Organic certification
USDA Organic is a regulated standard, not a marketing word. Products must be produced under the USDA organic standards, which prohibit genetic engineering and limit synthetic inputs to an approved list, and they're verified by a USDA-accredited certifying agent.
Independent testing
Under federal law, supplement makers are responsible for the safety and labeling of their products before they go on sale, and the FDA acts after a product reaches the market. That makes independent testing worth looking for. Testing matters for contaminants: when Consumer Reports tested protein drinks, every product had at least one sample containing arsenic, cadmium, lead or mercury, although a later risk assessment found typical intake unlikely to cause harm. The best sign is a brand that tests every batch for heavy metals, pesticides and microbes and publishes the results by batch number.
No gums, fillers or artificial flavors
A high-quality protein doesn't need gums, fillers or artificial thickeners, and some people find gums hard on their stomach. Natural flavors from ingredients such as cocoa or vanilla are a good sign that a formula hasn't been heavily engineered.
Built for absorption, not just intake
How well your body can use a protein depends on its amino acid makeup and digestibility. Plant proteins vary widely: in a lab comparison of plant protein isolates, essential amino acid content and leucine levels differed considerably, and lysine and methionine were typically lower than in animal proteins. Choosing a blend with a complete amino acid profile makes a meaningful difference.
What are the benefits of plant-based protein?
- Dairy-free. Plant proteins suit people with lactose intolerance or a milk allergy. Lactose intolerance and milk allergy are different conditions; milk is one of the nine major food allergens in the US.
- Allergen-aware. Many plant proteins are free from dairy, soy and gluten, but always check the label for your own allergens.
- Lower environmental impact. An analysis of food's environmental footprint covering about 38,700 farms found that the impacts of the lowest-impact animal products typically exceed those of vegetable substitutes.
- Comfortable digestion. Without lactose, plant proteins are often easier on the stomach for people who react to whey. Additives such as gums and sugar alcohols can still affect some people, so the full formula matters.
Pea vs. rice protein: how do they compare?
Different plant proteins have different strengths. The best formulas combine them.
| Protein source | Strengths | Considerations |
|---|---|---|
| Pea protein | Higher in lysine; highly digestible; supports muscle gains with training | Naturally lower in methionine |
| Rice protein | Higher in methionine; complements pea's profile | Naturally lower in lysine |
Pea and rice are a classic pairing because each covers the other's gap. Pea protein supports muscle: in a 12-week resistance-training trial, pea protein produced muscle thickness gains no different from whey, and among participants who were starting or returning to strength training, it outperformed a placebo. Rice is the mirror image on lysine and methionine, so together they provide a complete amino acid profile that neither delivers alone. Research on combining plant proteins shows how complementary blends can be designed to meet different nutritional goals.
How do you read a protein powder label?
A clean protein starts with what's not on the label. Ingredients are listed by weight, so the first few should be the protein sources, and they should be recognizable. Watch for:
- Gums such as xanthan or guar, which some people with sensitive stomachs prefer to avoid.
- High-intensity sweeteners such as sucralose, aspartame and acesulfame potassium, which are FDA-approved but which many people would rather skip.
- Sugar alcohols, which can cause digestive upset; foods likely to supply 50 grams of sorbitol a day must state that "excess consumption may have a laxative effect."
- Fillers with no nutritional purpose, such as maltodextrin.
Clean labels are short and easy to read at a glance. Federal law prohibits supplements that are adulterated or misbranded, but a tidy front label is no substitute for reading the ingredient list. For a quick checklist, see what makes a protein powder clean.
Which certifications should you look for?
Certifications work best alongside ingredient transparency. USDA Organic covers how ingredients are grown. Two certifications run by LGC answer two other questions: is it free of banned substances, and is the protein really there?
Informed Sport
Informed Sport is a banned-substance testing and certification program in which every batch of a certified product is tested before release, and certified products can be looked up on its website. It was built for drug-tested athletes, for whom a contaminated supplement can end a career, but it's useful assurance for anyone. Note that WADA and national anti-doping bodies don't approve supplements, so a label claiming "WADA approved" means nothing.
Informed Protein
Informed Protein verifies that the protein on the label is actually in the product. It targets "amino spiking" or "nitrogen spiking," where cheap free amino acids or other nitrogen-rich ingredients inflate a product's apparent protein content. Certification combines testing, a check on free amino acid content, a screen for common adulterants and manufacturing facility audits.
How much protein do you need?
The Recommended Dietary Allowance for adults is 0.8 grams of protein per kilogram of body weight. People who exercise regularly usually need more: the International Society of Sports Nutrition recommends 1.4 to 2.0 g/kg a day for building and maintaining muscle. For a fuller explanation, read what protein is and how much we need.
Why did Ora create So Lean & So Clean?
Most protein powders are built around what's cheapest to make. We built So Lean & So Clean around taste and what your body can use. Chef Ron tested more than 100 blends to get there.
Each serving delivers 23g of complete organic plant protein from a blend of organic pea and rice protein, plus two servings of organic greens and antioxidant-rich superfoods and a digestive enzyme blend. It has no added sugar, 1 to 3 grams of net carbs, and no artificial sweeteners, fillers or gums, and it's USDA Organic and vegan. It is also certified by both Informed Sport and Informed Protein, so every batch is screened for banned substances and its protein content is verified.
You can see how we test on our 5 Nation Standard page and look up certificates of analysis by batch. Clean and effective should be the same thing.
