Phosphatidylserine During a Bulk: Does It Make Sense?
Phosphatidylserine is usually discussed as a brain supplement, yet it has a following among lifters who hope it will blunt cortisol and help them grow. Our editorial team looked at whether it has a meaningful role during a mass-gaining phase.
What Phosphatidylserine Is
Phosphatidylserine (PS) is a phospholipid, one of the building blocks of cell membranes. It is especially concentrated in the inner layer of nerve cell membranes, where it supports signaling and membrane function.
The body can make PS, and small amounts come from foods such as organ meats, fish and soy. Typical dietary intake is estimated at well under 200 milligrams a day.
Early supplements were derived from bovine brain, but concerns about prion diseases led manufacturers to switch to soy- or sunflower-derived PS. Most modern research uses these plant-derived forms.
In the United States, the FDA has allowed qualified health claims relating PS to reduced risk of cognitive dysfunction in older adults, while noting the evidence is very limited. It is sold as a dietary supplement and is not prohibited by WADA.
The Cortisol Hypothesis
Cortisol is a catabolic hormone that rises with intense or prolonged exercise and psychological stress. The idea behind PS for bulking is that lower cortisol might shift the balance toward muscle building.
Monteleone and colleagues reported that PS blunted the ACTH and cortisol response to physical stress in healthy men. Starks and colleagues found that 600 milligrams a day for 10 days reduced cortisol response to moderate-intensity cycling and improved the testosterone-to-cortisol ratio.
Fahey and Pearl observed reduced cortisol and less perceived soreness in weight-trained men during a period of intense training, though the study was small.
It is important to note that cortisol spikes after exercise are a normal part of the adaptive response. Lowering them is not necessarily beneficial, and no study has shown that blunting cortisol with PS leads to more muscle.
Evidence on Recovery and Performance
Kingsley and colleagues studied PS during intermittent running and found limited effects on markers of muscle damage and oxidative stress. Some outcomes trended favorably, but most did not differ significantly from placebo.
Jäger, Purpura and Kingsley reviewed phospholipids in sport and noted that PS may have value for stress response and possibly cognition, but evidence for strength or hypertrophy outcomes was lacking.
Small studies on golfers and other athletes have suggested improved focus or stress resilience, which may matter in skill sports more than in mass building.
| Outcome | Evidence | Relevance to bulking |
|---|---|---|
| Cortisol response | Several small positive studies | Unclear benefit |
| Perceived soreness | Limited, mixed | Possibly minor |
| Muscle damage markers | Mostly null | Low |
| Strength or muscle mass | No convincing data | Low |
| Cognition and stress | Some support, especially older adults | Indirect |
Is It Worth It on a Bulk?
A well-designed bulking phase already involves a calorie surplus, ample carbohydrate and progressive training, all of which tend to limit excessive catabolic stress. Carbohydrate intake itself influences cortisol responses to exercise.
Given the lack of direct evidence for muscle gain, PS is a low priority compared with proven supplements such as creatine monohydrate and adequate protein.
- Proven priorities: total calories, protein (1.6–2.2 g/kg), progressive overload, sleep
- Strong supplement evidence: creatine monohydrate
- Moderate: caffeine for training quality
- Weak or indirect: phosphatidylserine
PS might be considered by individuals under high life stress or with poor sleep who want to see whether it helps them feel better, but expectations should be modest.
Cost is also a factor. Studied doses of 400 to 800 milligrams a day can be expensive relative to their uncertain benefits.
Safety and Practical Use
Plant-derived PS is generally well tolerated in studies. Reported side effects include occasional stomach upset and insomnia, particularly at higher doses.
People taking anticoagulants, anticholinergic or cholinergic drugs should consult a physician, as theoretical interactions exist. Pregnant and breastfeeding women should avoid it due to lack of data.
If you decide to try it, studies typically used 400 to 800 milligrams a day, often split into two doses. Taking it with meals may improve tolerance.
Track whether it changes your perceived recovery, sleep or stress over 4 to 6 weeks. If you notice nothing, discontinue it.
Editorial Team Conclusions
Phosphatidylserine can modestly blunt the cortisol response to exercise in some studies, but this has not translated into proven muscle gain.
During a bulk, its role is minor compared with total calories, protein, progressive training, sleep and creatine.
It is safe for most people at studied doses, but cost and weak evidence make it optional at best.
Related topics: cortisol and training adaptation, creatine monohydrate for mass gain, and evidence-based recovery strategies.
References
- Starks MA, Starks SL, Kingsley M, et al. The effects of phosphatidylserine on endocrine response to moderate intensity exercise. J Int Soc Sports Nutr. 2008;5:11.
- Monteleone P, Beinat L, Tanzillo C, et al. Effects of phosphatidylserine on the neuroendocrine response to physical stress in humans. Neuroendocrinology. 1990;52(3):243–248.
- Kingsley MI, Wadsworth D, Kilduff LP, et al. Effects of phosphatidylserine on oxidative stress following intermittent running. Med Sci Sports Exerc. 2005;37(8):1300–1306.
- Fahey TD, Pearl MS. The hormonal and perceptive effects of phosphatidylserine administration during two weeks of resistive exercise-induced overtraining. Biol Sport. 1998;15(3):135–144.
- Jäger R, Purpura M, Kingsley M. Phospholipids and sports performance. J Int Soc Sports Nutr. 2007;4:5.
