Phosphatidic Acid

ID: phosphatidic_acid

Aliases: PA, phosphatidate

Type: compound

Route/form: oral supplement in resistance-training studies

Status: supplement

Evidence level: human RCT

Best data tier: human controlled/review

Support scope: human, non-human/mechanistic

Source types: human_rct, mechanistic, preclinical

Linked sources: 4

Broad outcomes: Muscle growth / performance / recovery, mTORC / autophagy / nutrient signaling

Reading note: These are curation notes anchored to linked sources, not a clinical recommendation or protocol.

Targets / mechanism

• phospholipase D / phosphatidic acid signaling
• mechanical activation of mTORC1
• resistance-training hypertrophy adjunct hypothesis

Optimization domains

• mTORC1
• muscle
• muscle hypertrophy
• exercise performance
• resistance training
• nutrition

Research basis

• Phosphatidic acid has a specific mTORC1 mechanism story: mechanical/loading signals can route through PLD/PA toward mTOR signaling.
• Human resistance-training trials exist, including studies of muscle thickness, lean mass, and strength outcomes, so it is more than a purely in vitro supplement claim.
• It belongs as an mTORC activation comparator beside leucine/protein and far below endocrine/PED-level anabolic interventions.

Limits, risks, and missing evidence

• Human evidence is small and supplement-formulation dependent; effects should be treated as uncertain/modest rather than reliable hypertrophy pharmacology.
• Resistance training, total protein, energy surplus, and progressive overload dominate the signal.
• mTORC signaling endpoints do not guarantee visible hypertrophy or performance improvements.

Risk flags

• small trials
• supplement formulation dependent
• training context required
• modest effect if any

Linked papers, labels, and reviews

1. Phosphatidic acid enhances mTOR signaling and resistance exercise induced hypertrophy
   human_rct / pubmed_phosphatidic_acid_mtor_hypertrophy_2014
   Combines cell signaling and resistance-training supplementation data; direct anchor for phosphatidic acid as an mTOR-linked hypertrophy supplement claim.
2. Effects of phosphatidic acid supplementation on muscle thickness and strength in resistance-trained men
   human_rct / pubmed_phosphatidic_acid_resistance_men_2017
   Human resistance-trained men trial; useful direct evidence for muscle thickness/strength outcomes with PA supplementation.
3. Phosphatidic acid: a novel mechanical mechanism for how resistance exercise activates mTORC1 signalling
   mechanistic / pmc_phosphatidic_acid_mtor_mechanical_2009
   Mechanistic discussion of phosphatidic acid as part of mechanical activation of mTORC1 in skeletal muscle.
4. The role of phospholipase D and phosphatidic acid in the mechanical activation of mTOR signaling in skeletal muscle
   preclinical / pmc_pld_pa_mtor_skeletal_muscle_2006
   Foundational skeletal-muscle mechanistic work linking phospholipase D, phosphatidic acid, and mechanical mTOR signaling.