There’s a lot of confusion about protein supplements and what you should actually be looking for when choosing one. As someone who’s spent 10 years studying exercise science, metabolism, and female physiology, I want to break down exactly what makes a quality protein supplement and how to choose the right one for your needs.
A protein supplement is essentially a pre-broken down source of protein that straddles the line between food and a supplement. It’s an easy, almost pre-digested way for you to get amino acids into your body, either to meet your daily protein goals or for pre/post-workout nutrition.
I highly recommend a protein supplement to almost everyone because so many people struggle to get enough protein from their diet alone. I find that if I just supplement once a day, my issues with hitting my protein goals completely disappear. It’s a really easy solution – you just have to build a habit around it.
1. Third-Party Testing
The first thing you want to ensure is that whatever brand you’re buying is third-party tested. This is crucial because there’s a lot of cross-contamination in supplements, and some supplement companies have had issues with liver toxicity or ingredients that shouldn’t be there.
Without third-party testing, you don’t actually know if what you’re taking contains what it says it has, or if it contains things you don’t want. Sometimes supplements have cross-contamination with steroid-like substances, which could cause you to fail a drug test if you’re an athlete.
2. Transparent Labeling
You want to make sure there’s complete transparency in their labeling. This means they should list every single ingredient, including their complete amino acid profile. Avoid companies that list “blends” because when you see blends, you don’t know exactly what you’re getting or in what quantities.
3. Adequate Leucine Content
Leucine is one of our branched-chain amino acids and tends to be the primary signal for muscle-building pathways. You need about 2.5 grams of leucine to reach the threshold that helps enhance or turn on these pathways.
Many protein brands that list blends or don’t provide amino acid breakdowns may have inadequate leucine levels, or they might “protein spike” by adding individual amino acids like glutamine to increase the total protein content without providing a complete amino acid profile.
4. Complete Amino Acid Profile
Make sure you’re getting a complete amino acid profile, not an incomplete one. A great example of what NOT to use is collagen as a protein supplement. Collagen is an incomplete protein that’s missing essential amino acids, and you’d need an enormous amount to get even close to what a true protein supplement provides.
Whey Protein Benefits
Whey protein has a really robust response for the muscle-building processes we want from our training adaptations. It’s generally easier to mix, tastes great, and has excellent flavors available.
When to Choose Plant Protein
However, if you don’t like the taste of whey, have gut issues with whey, are vegan, or are lactose intolerant, plant protein is an excellent alternative. I personally had to switch to plant protein this past year due to some GI issues I was experiencing with whey.
Plant Protein Considerations
With plant protein, you’ll generally need a larger serving size to get the same amino acid benefits, specifically adequate leucine levels. Quality plant proteins mix different protein sources (like pea, rice, and soy protein isolates) to create a complete amino acid profile.
The Bottom Line
If you’re taking a well-dosed, transparent plant protein that has adequate amino acids and meets your leucine threshold, you’re totally fine. You won’t get less benefit from plant versus whey protein when the formulation is done correctly.
Daily Amount
It’s perfectly okay to take a protein supplement every day. You can take one serving daily, or up to one and a half to two servings depending on your total calorie and protein needs.
Timing Flexibility
You can take your protein supplement:
The most important factor is getting in your total daily protein intake. While timing around workouts can be beneficial, consistency with your daily protein goals matters more than perfect timing.
Balance with Whole Foods
Make sure you’re also getting protein from other sources like meats, grains, and other whole foods. These provide important micronutrients that you might miss if you only rely on protein powder. Some days you might need more supplementation, other days less – just ensure you’re not getting ALL your protein from powders.
Proprietary Blends
If a supplement lists “blends” without specific amounts, that’s a big red flag. You don’t know how much you’re getting of anything, which means you could be getting inferior ingredients mixed in.
Protein Spiking
Some companies add individual amino acids like glutamine or use collagen to inflate their total protein content without providing the complete amino acid profile you actually need.
Lack of Third-Party Testing
Companies that don’t third-party test their products leave you vulnerable to contamination, toxic ingredients, or products that don’t contain what’s listed on the label.
Incomplete Amino Acid Information
If a company won’t share their complete amino acid profile or leucine content, they’re likely hiding something about their formulation.
Understanding how to effectively use protein supplements is just one piece of optimizing your nutrition for your training goals. If you’re looking for comprehensive guidance on nutrition timing, macronutrient balance, and how to fuel your workouts properly, my Fast and Fed Guide provides detailed strategies for maximizing your nutrition around training.
For those wanting to determine their overall protein and caloric needs, my free macro calculator uses research-based equations to provide personalized recommendations based on your activity level and goals.
If you’re following a structured training program, The Lyss Method includes nutrition guidance alongside programming to help you optimize both your training and recovery through strategic nutrition practices.
When picking a protein supplement, look for companies that are science-based, share their research, are third-party tested, have appropriate dosages based on literature, and are transparent about their ingredients.
Be wary of the supplement industry – there’s a lot of money to be made, and many companies will mislead you with cross-contaminated products, toxic ingredients, inappropriate dosing, or protein spiking that inflates total protein content without providing the amino acids you actually need.
Whether you choose whey or plant protein, the most important factors are:
Remember, the goal is to make hitting your daily protein targets easier. A quality protein supplement is a tool to help you achieve consistent nutrition that supports your training and health goals.
Keywords: protein supplements, whey protein, plant protein, protein powder, amino acids, leucine, muscle building, post workout nutrition, protein intake, third party testing, supplement safety, nutrition timing, muscle recovery
I’m Exercise Physiologist, sports nutritionist, weight lifter, and ultra runner. I am here to bring science to your training in a no-nonsense way. I have helped thousands of women crush big lifting goals, cross race finish lines, and even do both. I’m here to help you do the same!
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