Vital Proteins recommends one to two scoops of their Original Collagen Peptides per day, with two scoops (20 grams) listed as the full serving size on the label. That two-scoop serving delivers 18 grams of protein and 70 calories. Whether you need one scoop or two depends on what you’re hoping to get out of it.
What One Scoop vs. Two Scoops Gets You
Each scoop of Vital Proteins Original Collagen Peptides weighs about 10 grams. One scoop gives you roughly 9 grams of protein and 35 calories, while two scoops double that to the full labeled serving of 18 grams of protein and 70 calories.
Clinical research supports a wide effective range. Taking 2.5 to 15 grams of hydrolyzed collagen daily is considered safe, and the dose you choose can be matched to your goal. Smaller amounts in the 2.5 to 5 gram range have shown benefits for skin and joints, while larger doses closer to 15 grams are used in studies looking at muscle mass and body composition. So one scoop (10 grams) falls comfortably in the middle, and two scoops (20 grams) puts you slightly above the studied range but is still the manufacturer’s recommended serving.
Matching Your Dose to Your Goal
Skin and Hair
If your main interest is skin hydration or reducing fine lines, one scoop per day is a reasonable starting point. A 2023 meta-analysis of 26 clinical trials with over 1,700 participants found that oral hydrolyzed collagen significantly improved skin hydration and elasticity, with the strongest effects appearing after eight weeks or more of consistent use. Skin hydration can start improving as early as week three or four, but visible changes to wrinkle depth and hair density typically take 8 to 12 weeks. One trial reported a 27.6% increase in hair density over that timeframe.
Joint Comfort
For joint pain, the effective doses in clinical research tend to be lower than you might expect. A six-month randomized controlled trial found that just 3 grams per day of collagen peptides was enough to relieve knee pain and improve function in adults with early-stage osteoarthritis. An eight-week study in active adults showed a 26% reduction in knee pain scores compared to placebo. One scoop provides more than enough collagen to hit these thresholds.
Muscle and Body Composition
If you’re using collagen to support muscle mass, particularly alongside resistance training, the evidence points toward higher doses. This is where two scoops per day makes more sense, putting you at 20 grams and giving your body more of the raw amino acids it needs for tissue repair and growth.
What’s Actually in Each Serving
Collagen peptides have a distinctive amino acid profile that sets them apart from other protein sources. About 47% of the amino acids in collagen are glycine, proline, and hydroxyproline. These three amino acids play central roles in building and maintaining connective tissue throughout your body, from skin and tendons to cartilage and bone. Only about 14% of collagen’s amino acids are the “essential” ones your body can’t make on its own, which is why collagen works best as a supplement alongside a balanced diet rather than as your primary protein source.
Getting the Most From Your Scoop
Your body needs vitamin C to turn the amino acids from collagen supplements into actual collagen in your tissues. Without adequate vitamin C, collagen synthesis slows down, which is why severe deficiency causes joint pain, poor wound healing, and weakened connective tissue. You don’t need megadoses. Your cells appear to be fully saturated at around 100 to 200 milligrams of vitamin C per day, which is easily covered by a single orange or bell pepper. If you’re taking your collagen in a morning smoothie with fruit, you’re likely already covered.
Timing matters less than consistency. The benefits seen in clinical trials come from daily use over weeks and months, not from any particular time of day. Vital Proteins collagen peptides dissolve in hot or cold liquids, so mixing them into coffee, water, or a smoothie all work equally well. The key is picking a routine you’ll actually stick with for at least 8 to 12 weeks, which is the window where most measurable changes show up in studies.
Can You Take Too Much?
The studied safe range tops out at about 15 grams per day, though the full two-scoop serving of 20 grams is what Vital Proteins puts on the label and many people use daily without issues. Collagen peptides are a food-derived protein, not a pharmaceutical, so there’s no established toxic upper limit. The most commonly reported side effects at higher doses are mild digestive discomfort, like bloating or a feeling of fullness. If you notice that with two scoops, dropping to one scoop is a simple fix that still keeps you well within the effective dose range for skin, hair, and joint benefits.