Protein — The Complete Guide

Protein: The Complete Guide

Protein is the foundation of muscle repair, hormone production, immune function, and satiety. If you're training hard — lifting, running, or playing sport — how much you eat, when you eat it, and what kind you choose all matter. This guide walks through the evidence.

How much protein do you actually need?

The Recommended Dietary Allowance (RDA) of 0.8 g/kg bodyweight is a floor for sedentary adults — not a target for trainees. A large 2017 meta-analysis of 1,863 participants by Morton and colleagues found diminishing returns above 1.6 g/kg/day for resistance-trained athletes — beyond that point, extra protein didn't add muscle.¹

The International Society of Sports Nutrition (ISSN) position stand recommends 1.4–2.0 g/kg/day for exercising individuals.² During a caloric deficit for fat loss, some research supports pushing higher — 2.3–3.1 g/kg — to preserve lean mass. Here's a simple breakdown:

• Sedentary adult: 0.8–1.0 g/kg
• General fitness: 1.2–1.6 g/kg
• Resistance training / muscle gain: 1.6–2.2 g/kg
• Cutting (fat loss with lean mass retention): 2.2–3.1 g/kg
• Older adults (50+): 1.2–1.6 g/kg (anabolic resistance is real — protein needs rise with age)

For a 180 lb (82 kg) lifter, that's roughly 130–180 g of protein per day. A single chicken breast is ~30 g; three eggs are ~18 g. Hitting the target is doable from food, but a protein shake bridges the gap quickly on busy days.

Whey vs isolate vs casein vs plant — which protein powder is best?

Each type has a place. The differences matter more for digestion and timing than for absolute muscle-building potential.

Whey Concentrate (WPC)

70–80% protein by weight. Retains some fat and lactose — so it's richer and creamier, but can cause bloating in lactose-sensitive people. Fast-absorbing, affordable, and the most studied. Best for: general use, post-workout, budget. See our GROW (2lb, chocolate / vanilla) and WHEY (5lb bulk) lines.

Whey Isolate (WPI)

90%+ protein by weight. Microfiltered or ion-exchange processed to strip most fat, lactose, and carbs. Faster-absorbing than concentrate and usually well-tolerated by lactose-sensitive athletes. Best for: cutting phases, lean gains, anyone with dairy sensitivity. Our LEAN (chocolate / vanilla) and Whey Armor Isolate 1lb line are 100% whey isolate.

Casein

Slow-digesting (6–8 hours) milk protein. Best for extended periods without food — bedtime, long meetings. Less ideal post-workout where rapid amino delivery wins. Not currently in our catalog.

Plant Protein (Pea, Rice, Hemp blends)

Modern blends combine pea (high leucine, lysine) with rice (high methionine) to deliver a complete amino profile rivaling whey. Ideal for vegans, those with dairy intolerance, or anyone cutting animal products. See our VEGAN line (chocolate / vanilla). For the full comparison, see our vegan supplements guide.

Collagen

Different animal — collagen peptides are great for skin, joints, and connective tissue but poor for muscle protein synthesis (missing key aminos). Use it in addition to a complete protein, not as a replacement. See our Collagen Powder.

When should you take protein?

The "anabolic window" was oversold. The original idea — that you must consume protein within 30 minutes post-workout or waste the session — has been largely debunked by newer research. A 2013 meta-analysis by Schoenfeld et al. found that total daily protein intake matters far more than precise timing.³

That said, these patterns still hold:

• Distribute protein across 3–5 meals, ~20–40 g each. Muscle protein synthesis saturates around 40 g of high-quality protein per feeding.
• Pre- or post-workout is a convenient time to get a dose — the meal-timing benefit is small but real when total daily intake is borderline.
• Protein before bed (especially slower-digesting forms) may improve overnight recovery and muscle retention.

The practical takeaway: hit your daily total first, spread it across the day, and don't stress about a 30-minute window.

Is too much protein bad for your kidneys?

For people with healthy kidney function, no. Multiple long-term studies have shown that high-protein diets (up to 2.5–3.4 g/kg) do not harm kidney function or bone health in healthy adults. If you have existing kidney disease, work with your doctor on protein targets — the concern is specific to compromised renal function, not a general warning.

Protein FAQ

Can I take too much protein in one sitting?

Your body won't "waste" excess protein — it just breaks it down for energy or tissue repair over time. The muscle-building ceiling per meal is ~40 g of high-quality protein, but extra still contributes to daily totals and satiety.

Is whey protein safe for daily use?

Yes. Whey is one of the most studied supplements and has an excellent safety profile in healthy adults. If you experience bloating or GI discomfort, switch to an isolate or try a plant-based option.

Do I need protein powder, or can I just eat chicken?

Whole-food protein is ideal. Powders exist for convenience — when you physically can't cook a meal or digest a heavy one (e.g., post-workout). Think of them as a tool, not a replacement for real food.

What's the difference between your GROW and LEAN lines?

GROW is whey concentrate — higher calorie, creamier, and more affordable per gram. LEAN is whey isolate — leaner, faster-absorbing, and friendlier to lactose-sensitive stomachs. Both work. Choose based on your goals and digestion.

Related reading

• Creatine — The Complete Guide
• Recovery — The Complete Guide
• Vegan Supplements — The Complete Guide
• Mass Gainers — The Complete Guide

References

1. Morton RW, Murphy KT, McKellar SR, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training–induced gains in muscle mass and strength in healthy adults. British Journal of Sports Medicine. 2018;52(6):376-384. PubMed: 28698222
2. Jäger R, Kerksick CM, Campbell BI, et al. International Society of Sports Nutrition Position Stand: protein and exercise. Journal of the International Society of Sports Nutrition. 2017;14:20. PubMed: 28642676
3. Schoenfeld BJ, Aragon AA, Krieger JW. The effect of protein timing on muscle strength and hypertrophy: a meta-analysis. Journal of the International Society of Sports Nutrition. 2013;10(1):53. PubMed: 24299050

This guide is for educational purposes and is not medical advice. Consult your physician before starting a supplement program, especially if you have underlying health conditions.