How to Pick the Cleanest, Healthiest Shake — The Func Lab Way
At The Func Lab, we nerd out on labels so you don’t have to. Here’s exactly how to choose a shake that’s as clean, safe, and smart as your goals.
Choosing a protein powder today can feel overwhelming — the shelves are full of flashy labels, bold claims, and long ingredient lists. But if you’re drinking protein daily, it matters more than ever to understand what you’re putting in your body. Many powders are loaded with artificial sweeteners, thickeners, fillers, or even hidden chemicals under vague names like "natural flavors." So how do you pick a clean, safe, and effective protein powder?
Start by looking for third-party testing — certifications like NSF Certified for Sport or Informed Sport mean the brand has been tested independently for purity, banned substances, and label accuracy. This is your first line of defense, especially if you train seriously or take your health goals seriously.
Next, steer clear of artificial sweeteners like sucralose, aspartame, or acesulfame-K — these can mess with your gut microbiome and insulin response over time. Instead, choose products that are naturally sweetened with stevia, monk fruit, or are unsweetened so you can control the flavor.
One of the biggest red flags on a label is the term “natural flavors.” While it sounds harmless, this umbrella term can contain dozens of lab-derived chemicals — many of which don't have to be disclosed.
Also avoid gums and thickeners like xanthan gum, guar gum, or carrageenan, which may lead to bloating or gut irritation in sensitive individuals.
If you're choosing a whey-based powder, opt for those made from grass-fed or hormone-free milk sources. For plant-based options, go with organic pea, brown rice, or hemp — ideally from brands that disclose their sourcing practices.
And finally, keep it simple. Look for protein powders with fewer than seven ingredients, and make sure you recognize every single one of them. Your ideal protein powder should contain only what you need — a clean protein source, maybe a natural flavor, and a minimal sweetener if needed.
The simpler your supplement, the better it is for your digestion, long-term health, and consistency.
