Stackexpand_less
Analysisexpand_less
Please sign in to access analysis.
Profileexpand_less
Supplementsexpand_more
Daily Amino Acid
21st Century
4.7
★ ★ ★ ★ ★
(8008 ratings)
Leucine 105 mg
Cysteine 11 mg
Lysine 93 mg
Histidine 17 mg
Valine 58 mg
Isoleucine 63 mg
Tyrosine 31 mg
Score 15.0
This product offers a very broad spectrum of amino acids at an exceptionally low price, but the dosages are minimal across the board, making it largely ineffective for achieving its stated health and performance goals. It provides token amounts rather than functional doses of key amino acids.
Quantity: 120 Tablet(s)Servings size: 1 Tablet(s) (120 servings)
Selected goals:
Other goals:
Muscle Gain
Fitness
Weight Gain
Immunity
Skin Health
leaderboard Score 15.0
This product offers a very broad spectrum of amino acids at an exceptionally low price, but the dosages are minimal across the board, making it largely ineffective for achieving its stated health and performance goals. It provides token amounts rather than functional doses of key amino acids.
Daily Amino Acid by 21st Century is an affordable, broad-spectrum amino acid supplement providing a range of essential and conditionally essential amino acids. However, its primary limitation lies in the extremely low dosages of almost all active ingredients per serving. While it technically contains the listed amino acids, the quantities are often negligible when compared to scientifically backed effective doses for the stated goals, making it more of a 'micro-dose' blend rather than a functionally potent supplement for targeted health or performance improvements. For consumers seeking noticeable benefits in areas like muscle growth, cognitive function, or immune support, this product's formulations are significantly underdosed compared to industry standards and clinical recommendations, which often require hundreds of milligrams to several grams of specific amino acids per serving.
- Very low cost per serving, making it highly affordable.
- Contains a wide variety of amino acids, including essential ones, in a single tablet.
- Extremely underdosed for almost all stated health and performance goals.
- Will likely provide minimal to no noticeable benefits due to insufficient active ingredient quantities.
- Not suitable for individuals seeking significant effects for muscle gain, cognitive support, or immunity.
- Users may not experience any significant benefits from this supplement due to its low potency, potentially leading to disappointment or a misunderstanding of amino acid efficacy.
- Those with specific deficiencies requiring higher doses of individual amino acids will not find this product adequate.
$9.99($0.08 per serving)
 Amazon | $ 9.99 | |
 iHerb | $ 9.99 |
| Ingredient | Amount per serving |
|---|---|
| Calcium (Dicalcium Phosphate, Calcium Carbonate) | 150 mg |
| Sodium | 5 mg |
| L-Histidine (L-Histidine Hydrochloride) | 17 mg |
| L-Isoleucine | 63 mg |
| L-Leucine | 105 mg |
| L-Lysine (L-Lysine Hydrochloride) | 93 mg |
| DL-Methionine | 21 mg |
| L-Cysteine (L-Cysteine Hydrochloride) | 11 mg |
| L-Phenylalanine | 32 mg |
| L-Tyrosine | 31 mg |
| L-Threonine | 69 mg |
| L-Valine | 58 mg |
Categories
Tyrosine 10.0
The L-Tyrosine content of 31mg is negligible compared to standard supplemental doses of 500mg to 1500mg, which are typically used for cognitive or mood support. This renders it largely ineffective for benefits associated with this amino acid.
Lysine 10.0
The L-Lysine content of 93mg is very low when compared to common standalone Lysine supplements that provide 500mg to 1000mg per serving. This dosage is unlikely to offer significant benefits for its common uses, such as immune support.
Cysteine 10.0
The L-Cysteine content of 11mg is minimal and significantly lower than doses found in supplements targeting skin, hair, or detoxification (which can range from 100mg to 900mg). This quantity provides little functional value.
Goals
Brain Health 10.0
The dosages of L-Tyrosine (31mg) and L-Phenylalanine (32mg) are far below the clinically studied amounts (typically hundreds of milligrams to grams) required to significantly support brain health or neurotransmitter production. Consequently, any noticeable cognitive benefits are unlikely.
Mental Focus 10.0
Similar to brain health, the minimal quantities of L-Tyrosine and L-Phenylalanine are insufficient to impact mental focus, as effective doses for enhancing alertness and concentration are considerably higher than what is provided.
Mood Support 10.0
The levels of amino acids like L-Tyrosine and L-Phenylalanine are too low to effectively contribute to mood regulation. For genuine mood support, much higher doses are typically recommended to serve as precursors for mood-affecting neurotransmitters.
Recommended Alternatives
80 Value 
L-Tyrosine 500 mg
Source Naturals
4.7
★★★★★
(2046 ratings)
Offers a significantly more effective dosage of L-Tyrosine (500mg) for a marginally higher price per serving compared to the original product, providing a much better return on investment for cognitive benefits.
75 Value 
Mega-Size BCAA 1000 Caps
Optimum Nutrition
4.6
★★★★★
(25137 ratings)
Provides a balanced 2:1:1 ratio of BCAAs (500mg Leucine, 250mg Isoleucine, 250mg Valine) in clinically relevant amounts per serving, offering genuine support for muscle recovery and growth at a very competitive price for its efficacy, despite being slightly more expensive per serving than the original.
78 Value 
L-Lysine 500 mg
NOW
4.8
★★★★★
(4149 ratings)
Delivers a much more substantial and effective dose of L-Lysine (500mg) at the same price point per serving as the original product, offering superior value for immune and general health support by providing five times the active ingredient.
90 Performance 
Dopamine Brain Food
NS Natural Stacks
4.5
★★★★★
(384 ratings)
This alternative offers significantly higher, therapeutically relevant doses of L-Tyrosine (650mg) and L-Phenylalanine (500mg), crucial for neurotransmitter synthesis and cognitive support, unlike the negligible amounts in the original product.
95 Performance 
The Original Watermelon Explosion
XTEND
4.5
★★★★★
(46842 ratings)
Delivers substantial and clinically relevant doses of branched-chain amino acids (3500mg Leucine, 1750mg Isoleucine, 1750mg Valine) in the optimal 2:1:1 ratio, highly effective for muscle protein synthesis and recovery, unlike the negligible amounts in the original product.
92 Performance 
Super Lysine+ Immune Support
Quantum Health
4.6
★★★★★
(18691 ratings)
Delivers a potent dose of L-Lysine (1500mg) for immune support, particularly beneficial for cold sore management, and includes additional immune-boosting ingredients for enhanced efficacy, far exceeding the original product's minimal lysine content.
70 Budget 
L-Lysine 500 mg
NOW
4.8
★★★★★
(13912 ratings)
This alternative offers 500mg of L-Lysine, significantly more than the original product's 93mg, at a lower price per serving, providing a much more effective dose for immune support and other lysine-related benefits.
75 Budget 
L-Lysine 600 mg
21st Century
4.7
★★★★★
(1178 ratings)
With 600mg of L-Lysine per serving, this option delivers a substantially higher and more effective dose than the original, still from the same brand, at a very competitive and even lower price per serving.
72 Budget 
L-Lysine 500 mg
NOW
4.9
★★★★★
(441 ratings)
This NOW L-Lysine supplement provides 500mg of L-Lysine per serving, a significantly more potent and therapeutically relevant dose compared to the original product, while being available at a lower cost per serving.
80 Value
L-Tyrosine 500 mg
Source Naturals
4.7
★★★★★
(2046 ratings)
Offers a significantly more effective dosage of L-Tyrosine (500mg) for a marginally higher price per serving compared to the original product, providing a much better return on investment for cognitive benefits.
75 Value
Mega-Size BCAA 1000 Caps
Optimum Nutrition
4.6
★★★★★
(25137 ratings)
Provides a balanced 2:1:1 ratio of BCAAs (500mg Leucine, 250mg Isoleucine, 250mg Valine) in clinically relevant amounts per serving, offering genuine support for muscle recovery and growth at a very competitive price for its efficacy, despite being slightly more expensive per serving than the original.
78 Value
L-Lysine 500 mg
NOW
4.8
★★★★★
(4149 ratings)
Delivers a much more substantial and effective dose of L-Lysine (500mg) at the same price point per serving as the original product, offering superior value for immune and general health support by providing five times the active ingredient.
90 Performance
Dopamine Brain Food
NS Natural Stacks
4.5
★★★★★
(384 ratings)
This alternative offers significantly higher, therapeutically relevant doses of L-Tyrosine (650mg) and L-Phenylalanine (500mg), crucial for neurotransmitter synthesis and cognitive support, unlike the negligible amounts in the original product.
95 Performance
The Original Watermelon Explosion
XTEND
4.5
★★★★★
(46842 ratings)
Delivers substantial and clinically relevant doses of branched-chain amino acids (3500mg Leucine, 1750mg Isoleucine, 1750mg Valine) in the optimal 2:1:1 ratio, highly effective for muscle protein synthesis and recovery, unlike the negligible amounts in the original product.
92 Performance
Super Lysine+ Immune Support
Quantum Health
4.6
★★★★★
(18691 ratings)
Delivers a potent dose of L-Lysine (1500mg) for immune support, particularly beneficial for cold sore management, and includes additional immune-boosting ingredients for enhanced efficacy, far exceeding the original product's minimal lysine content.