Alpha-GPC and L-tyrosine do different jobs, so pick by the problem or stack both. Alpha-GPC, a choline source, raised lower-body force in a 2015 trial (13 men, 600 mg a day for 6 days) and sharpened a focus test in a 2024 trial of 20 lifters, while L-tyrosine, the raw material for dopamine and norepinephrine, helps thinking mainly under stress (2015 review). No trial we found tested the pair on its own, so stacking them is a sensible bet, not a proven combo.
People search the two names side by side, and US searches for “alpha gpc” were up 22% in July to September 2026 against April to June (Google Keyword Planner). Here is the showdown, numbers in.
The Short Version
- Alpha-GPC and strength: 600 mg a day for 6 days raised peak force on an isometric mid-thigh pull against placebo in 13 college men (JISSN, 2015), but a 48-man trial in 2017 found no change in strength.
- Alpha-GPC and focus: one dose of 315 mg or 630 mg improved Stroop test scores an hour later in 20 resistance-trained men (Nutrients, 2024; the author advises the ingredient’s maker).
- L-tyrosine works under pressure: it helps thinking and working memory when stress temporarily drains dopamine and norepinephrine, and its effect on physical exercise “seems minimal” (review, 2015).
- Ninja Up holds 1000 mg of L-tyrosine and 600 mg of Alpha GPC (a 50% powder, about 300 mg of alpha-GPC) a scoop, next to 300 mg of caffeine anhydrous and 135 mg of Infinergy.
What Is the Difference Between Alpha-GPC and L-Tyrosine?
Alpha-GPC feeds acetylcholine, the messenger nerves use to fire muscles, also tied to attention, while L-tyrosine feeds dopamine and norepinephrine, the chemistry of drive under pressure. Think of a heist crew on Ocean Drive: alpha-GPC is the wheelman keeping the brain to muscle signal clean, and tyrosine is the fixer you call when the night goes sideways.
| Alpha-GPC | L-Tyrosine | |
|---|---|---|
| What it is | A choline compound, used to make acetylcholine | An amino acid in protein, used to make dopamine and norepinephrine |
| Best human evidence | Lower-body force after 6 days (13 men, 2015); Stroop scores after one dose (20 men, 2024) | Alertness under sleep loss (1995); working memory under heavy mental load (2013, and the 2015 review) |
| Doses studied | 250 to 630 mg, one dose or daily for up to a week | 2 g in a lab memory test; 150 mg per kg of body weight in a sleep-loss study |
| Where it fell short | No strength change in 48 men (2017); no jump or hormone change (2024) | Little effect on a rested day or on physical exercise |
| In a scoop of Ninja Up | Alpha GPC (50%) 600 mg | L-Tyrosine 1000 mg |
Does Alpha-GPC Actually Help in the Gym?
Somewhat, mostly for power and quick thinking, not size. In 2015, 13 college men on 600 mg a day for 6 days raised their mid-thigh pull peak force by about 99 newtons, while on placebo it fell by 39. In 2017, 48 men showed no strength difference after a week at 250 or 500 mg, though the 250 mg group gained the most jump power.
The focus side is newer. In 2024, 20 trained men took 315 mg, 630 mg or a placebo; an hour later both doses raised Stroop scores (accuracy under conflicting cues), with no change in jumps or growth hormone. The author is a paid adviser to the ingredient’s maker. Doses, timing and the long-term caution are in our alpha GPC workout guide.
What About L-Tyrosine?
L-tyrosine is the stress specialist: it helps when the tank is running low and does little on a calm, rested day. A 2015 review concluded it works best in short, stressful or mentally demanding situations, while dopamine and norepinephrine are temporarily depleted.
The cleanest lab example: in 2013, 22 students took 2 g of L-tyrosine or a placebo, and an hour later tyrosine lifted their score on the harder 2-back memory task but not on the easy 1-back version. The sleep-loss and cold studies, and how much to take, are in our L-tyrosine focus guide.
Can You Take Alpha-GPC and L-Tyrosine Together?
Yes, and the logic holds because they feed different systems. The honest gap: we found no trial of the pair on its own. The closest is a 2010 study of a blend holding alpha-GPC, L-tyrosine, phosphatidylserine, caffeine and more: in 19 active students, reaction time slipped on placebo after 10 minutes of exhausting exercise, while the blend group held theirs.
The caffeine in it, and signs the effect faded after four weeks of daily use, mean it cannot tell you which ingredient did the work. Read it as a reason to try the pairing on a heavy day, not as proof. More pairings, and the ones to skip, are in our nootropic stacks guide.
Which One Should You Pick?
- Pick alpha-GPC if the session is about power: heavy singles, jumps, sprints. That is where its small evidence points.
- Pick L-tyrosine if the problem is the state you arrive in: five hours of sleep, a brutal workday.
- Take both if it is a heavy session after a bad night, which for a man with a job and kids is most of them.
Are Alpha-GPC and L-Tyrosine Safe?
For healthy adults at the doses studied, neither has a worrying short-term record, with three notes. In the 2017 trial, the 500 mg alpha-GPC group showed lower thyroid-stimulating hormone after the first dose, a lab marker whose meaning here is unclear; 250 mg did not. Alpha-GPC also carries one long-term caution for people over 50, covered in the alpha GPC guide above.
A 1995 sleep-loss study gave 150 mg of L-tyrosine per kilogram of body weight, about 12 g for an 80 kg man, and called that dose relatively benign. In a pre-workout, the caffeine around these two deserves more respect than they do. If you take prescription medication, check with your doctor first.
Coach’s Corner: The Focus Ramp for a Heavy Day
- Easy cardio: 5 minutes on a bike or rower, no rest. Nose breathing: warm, not tired.
- Bodyweight squats: 2 x 10, 30 seconds rest. Ribs down, knees over toes.
- Ramp sets of your main lift: 5 reps at about 50% of your working weight, 3 at 70%, 1 at 85%, 60 to 90 seconds rest. Same set-up every rep: focus gets rehearsed here.
- Working sets: 3 to 5 sets of 3 to 6 reps, 2 to 3 minutes rest. Leave one or two clean reps in the tank.
Scoop timing: about an hour before your working sets; the 2024 alpha-GPC and 2013 tyrosine tests both measured one hour after the dose.
Healthy adults: if you have an injury, pain, a heart condition, or you are new to training, check with your doctor before you start. Stop if it hurts.
The Fuel Plan
| What | 80 kg lifter | 100 kg lifter |
|---|---|---|
| Protein a day (1.4 to 2.0 g per kg, ISSN) | 112 to 160 g | 140 to 200 g |
| Protein per meal (ISSN: 20 to 40 g, every 3 to 4 hours) | 20 to 40 g | 20 to 40 g |
| Tyrosine, food first | An amino acid in protein: every protein meal brings some | |
| Caffeine | Ninja Up lists 300 mg of caffeine anhydrous plus 135 mg of Infinergy; the 300 mg alone is three quarters of the 400 mg a day the FDA cites for most adults: skip the coffee | |
| Timing | Scoop an hour before working sets; protein before or after training (ISSN: both work) | |
These are general numbers for healthy adults. With kidney disease, diabetes or any medical diet, ask your doctor or a registered dietitian.
Where Ninja Up Fits
Want both? Take one scoop that holds both. Ninja Up is our high-stim pre-workout: 1000 mg of L-tyrosine and 600 mg of Alpha GPC (50%, about 300 mg of alpha-GPC, close to the 315 mg dose that sharpened the 2024 Stroop test), plus 150 mg of L-theanine and the caffeine. The tyrosine is half the 2 g of the 2013 study: a focus side, not a sleepless-night rescue. If you lift after a long day and want one scoop instead of three tubs, this is the tub.
Who it’s for: experienced caffeine users who want energy, focus and the pump in one scoop. Who it’s not for: the caffeine sensitive, anyone under 18, pregnant or nursing, or anyone avoiding yohimbine (Ninja Up NoYo carries the same tyrosine and alpha GPC without it).
Ninja Up: The Doses This Article Is About
Per serving, straight from the label. The full label is on the product page.
| L-Tyrosine | 1000 mg |
| Alpha GPC (50% Alpha Glycerylphosphorylcholine) | 600 mg |
| L-Theanine | 150 mg |
| Caffeine Anhydrous | 300 mg |
| Infinergy™ (as Dicaffeine Malate) | 135 mg |
| Alpha Yohimbine 90% Rauwolscine (Rauwolfia vomitoria)(Root) | 2.5 mg |
A tub is $49.99 for 25 scoops: $2.00 a scoop, or $1.70 with Subscribe and Save (15% off). In stock in Energy Drink, Grape Bubblegum, Juiced Fruit and Pineapple Sangria.
The partner customers add to Ninja Up most often is Ninja Gains, the protein for after the session.
I really love this pre workout. It gives really great energy and focus that lasts throughout my entire workout. This is definitely one of my top three pre's right now. Juiced fruit tastes amazing....
Best Pre on the market
This pre workout hits hard with clean ingredients. Taste amazing 🤩. You won’t regret buying this. Customer service was amazing too
Ninja Up lists 300 mg of caffeine anhydrous plus 135 mg of Infinergy (dicaffeine malate) a scoop, and 2.5 mg of alpha yohimbine (rauwolscine): experienced stimulant users only. Not for anyone under 18, pregnant or nursing. If you have a heart condition or take medication, check with your doctor first, and do not stack it with other caffeine.
Frequently Asked Questions
Can you take alpha-GPC and L-tyrosine together?
Yes. They feed different systems: alpha-GPC supplies choline for acetylcholine, and L-tyrosine is the raw material for dopamine and norepinephrine. No trial has tested the pair alone that we found, but a 2010 blend holding both, plus caffeine, kept reaction time steady after exhausting exercise in 19 active students.
Which is better for focus, alpha-GPC or L-tyrosine?
It depends on your day. Alpha-GPC improved Stroop scores in rested, trained men an hour after one dose (2024, 20 men), while L-tyrosine shows its edge when you are stressed, short on sleep or doing hard mental work.
Is there a supplement that has both alpha-GPC and L-tyrosine?
Yes. Ninja Up and Ninja Up NoYo each list 1000 mg of L-tyrosine and 600 mg of Alpha GPC (50%) a scoop, with 300 mg of caffeine anhydrous plus 135 mg of Infinergy. Ninja Mode lists the same two with less caffeine: 175 mg of caffeine anhydrous plus 100 mg of dicaffeine malate.
How much alpha-GPC and L-tyrosine should you take?
The alpha-GPC trials used 250 to 630 mg; the tyrosine studies used 2 g in a lab memory test and 150 mg per kilogram of body weight in a sleep-loss study. Stay at a product’s label dose and take it about an hour before the work that matters.
Next on the job: the L-theanine and caffeine stack, the other half of a focus scoop. Want tyrosine, alpha GPC and the caffeine in one shaker? Ninja Up is the tub.
Sources
- Jongkees BJ, et al. Effect of tyrosine supplementation on clinical and healthy populations under stress or cognitive demands: a review. Journal of Psychiatric Research, 2015.
- Colzato LS, et al. Working memory reloaded: tyrosine repletes updating in the N-back task. Frontiers in Behavioral Neuroscience, 2013.
- Neri DF, et al. The effects of tyrosine on cognitive performance during extended wakefulness. Aviation, Space, and Environmental Medicine, 1995.
- Bellar D, et al. The effect of 6 days of alpha glycerylphosphorylcholine on isometric strength. J Int Soc Sports Nutr, 2015.
- Marcus L, et al. Evaluation of the effects of two doses of alpha glycerylphosphorylcholine on physical and psychomotor performance. J Int Soc Sports Nutr, 2017.
- Kerksick CM. Acute alpha-glycerylphosphorylcholine supplementation enhances cognitive performance in healthy men. Nutrients, 2024 (the author advises the sponsor, an alpha-GPC maker).
- Hoffman JR, et al. The effects of acute and prolonged CRAM supplementation on reaction time and subjective measures of focus and alertness in healthy college students. J Int Soc Sports Nutr, 2010.
- Jäger R, et al. International Society of Sports Nutrition Position Stand: protein and exercise. J Int Soc Sports Nutr, 2017.
- US Food and Drug Administration. Spilling the Beans: How Much Caffeine Is Too Much?
How we wrote this: we rebuilt this page because people search “alpha gpc and l tyrosine” and “alpha gpc vs l tyrosine”, and alpha GPC searches rose 22% over the summer (Google Keyword Planner). We read the studies above on PubMed and checked every Ninja Up dose against the label. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
