Skip to main content

Amino Acid

L-Aspartic Acid

Also known as: Aspartic acid, L-Aspartate, Aspartate, DAA (when discussing D-aspartic acid context)

C
Evidence

L-aspartic acid is a non-essential amino acid involved in protein synthesis, neurotransmitter function, and energy metabolism. Limited direct evidence supports supplementation for athletic performance or testosterone enhancement in healthy individuals.

Primary uses

  • Protein synthesis support
  • Energy metabolism
  • General amino acid supplementation

How it works

  • Incorporated into proteins during translation
  • Precursor for neurotransmitters (aspartate, glutamate)
  • Substrate in energy-producing metabolic pathways
  • Component of purines and pyrimidines for nucleotide synthesis

Dosage

Typical range
500 mg - 3 g daily
Timing
Any time; often taken with meals or as part of amino acid blends
With food
No specific requirement; can be taken with or without food
Duration
Safe for long-term use as part of normal protein intake; no established protocol for supplemental dosing
Special populations
Generally safe for most populations; pregnant/nursing women should consult healthcare providers

Forms

  • Powder· 70/100
  • Capsule· 70/100
  • Tablet· 70/100

Safety

Common side effects

  • Generally well-tolerated at typical doses
  • Minimal side effects reported in literature
  • High doses may cause gastrointestinal distress

Contraindications

  • Phenylketonuria (PKU) — use with medical supervision
  • Individuals with kidney disease should consult healthcare provider before supplementing

Evidence notes

L-aspartic acid is naturally occurring and essential for normal physiology, but direct supplementation evidence in healthy humans is limited. Most research conflates it with D-aspartic acid (DAA), which has been studied more heavily with mixed results for testosterone. Insufficient RCT data to support specific performance claims.

Grade C: Mostly observational or small trials; mechanism is plausible but unproven at scale.

Related in Amino Acid

Check a full stack

Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.

Open the checker

Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider.