Daily Amino Acid
21st Century
Daily Amino Acid
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 40.0
An extremely affordable daily amino acid blend providing a broad spectrum of amino acids. While comprehensive in its ingredient list, the dosages are largely sub-optimal for achieving significant impacts on the wide array of health goals it targets.
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 40.0
An extremely affordable daily amino acid blend providing a broad spectrum of amino acids. While comprehensive in its ingredient list, the dosages are largely sub-optimal for achieving significant impacts on the wide array of health goals it targets.
insights Analysis
21st Century Daily Amino Acid is positioned as a comprehensive amino acid supplement, aiming to support a wide array of health goals from brain function and mood to muscle development, immunity, and skin/hair health. It contains a blend of essential amino acids (Leucine, Isoleucine, Valine, Lysine, Threonine, Phenylalanine, Methionine, Histidine) and a conditionally essential amino acid (Cysteine), along with calcium and sodium. The product's strength lies in its affordability and inclusion of a diverse amino acid profile. However, a critical analysis reveals that the dosages of most individual amino acids are significantly below what is typically considered therapeutically effective or even minimally beneficial for the specific goals it targets. For instance, BCAAs are present at only 226mg total, far from the 5-10g often recommended for muscle support. Similarly, L-Tyrosine and L-Phenylalanine, precursors for neurotransmitters, are dosed at only 31mg and 32mg respectively, which is considerably lower than the hundreds to thousands of milligrams usually studied for cognitive or mood benefits. This suggests that while it provides the 'building blocks,' the quantity is likely too small to elicit a noticeable physiological response for many of the complex goals advertised. Online reviews, while generally positive, often highlight its value for money rather than specific profound effects on these broad goals. Nutritionists typically advocate for products with clinically relevant dosages for targeted interventions.
- Very cost-effective with a low price per serving, making daily amino acid supplementation accessible.
- Contains a wide variety of essential and conditionally essential amino acids, offering general nutritional support.
- Includes a moderate amount of calcium, which contributes to bone health alongside amino acid benefits.
- Individual amino acid dosages are exceedingly low, rendering the product likely ineffective for significant muscle gain, cognitive enhancement, or robust immune support.
- The BCAA ratio and total quantity are far below recommendations for optimal muscle protein synthesis and recovery.
- Unlikely to provide noticeable benefits for skin, hair, energy, or detoxification due to the minimal concentrations of relevant amino acids.
- Individuals with Phenylketonuria (PKU) should avoid this product due to the presence of L-Phenylalanine.
- Those with specific health conditions or on medication should consult a healthcare professional, especially given the broad range of amino acids and associated metabolic pathways.
$9.99($0.08 per serving)
 Amazon | $ 9.99 | |
 iHerb | $ 9.99 |
bolt Effectiveness for goals
Essential amino acids are building blocks of protein that the human body cannot produce on its own and must obtain through diet. They are crucial for various vital functions, including protein synthesis, tissue repair, enzyme production, and nutrient absorption. Ensuring adequate intake supports overall health and physiological processes.
L-Leucine, L-Isoleucine, and L-Valine, known as BCAAs, are primarily metabolized in muscle tissue rather than the liver. They play a significant role in muscle protein synthesis, which is essential for muscle growth and repair. BCAAs can also be utilized as an energy source during physical activity.
L-Lysine is an essential amino acid involved in protein synthesis and calcium absorption. It is also important for the production of collagen, a protein vital for connective tissues like skin, tendons, and cartilage. Additionally, L-Lysine supports immune system function and the production of hormones and enzymes.
L-Phenylalanine is an essential amino acid that serves as a precursor for L-Tyrosine. L-Tyrosine is then used to synthesize important neurotransmitters such as dopamine, norepinephrine, and epinephrine, which play roles in mood, cognition, and stress response. This metabolic pathway highlights their interconnected functions in brain chemistry.
L-Methionine is an essential sulfur-containing amino acid crucial for various metabolic processes. It plays a key role in detoxification, as it's involved in the synthesis of other sulfur compounds like L-Cysteine and taurine. L-Methionine also contributes to the health of hair, skin, and nails.
schedule Dosage, timing & forms
Essential amino acid supplements are often taken before or after physical activity to support muscle recovery and growth. Alternatively, they can be consumed between meals to help maintain amino acid levels in the body. The best timing can depend on individual dietary habits and wellness goals.
Tablet forms offer convenience and precise dosing, as each tablet contains a consistent amount of ingredients. They are also easy to transport and consume without mixing, which is ideal for on-the-go use. Tablets generally contribute to a longer shelf life for the ingredients.
Taking amino acids on an empty stomach may lead to faster absorption into the bloodstream. However, some individuals prefer to take them with a light meal or snack to prevent potential stomach discomfort. The optimal approach can vary by individual tolerance and desired outcome.
Some amino acid supplements include calcium, often for its role in bone health or as a binding agent in the tablet form. The amount can vary significantly, but a blend might provide a moderate amount, such as 300mg per serving, contributing to daily calcium intake. Always refer to the supplement facts panel for the precise quantity.
While essential amino acids are vital for health, excessively high doses of individual amino acids can potentially lead to imbalances. However, broad-spectrum essential amino acid blends are typically formulated within safe dietary ranges. It's always advisable to adhere to the recommended serving size on the product label unless otherwise directed by a qualified professional.
health_and_safety Safety & interactions
Generally, essential amino acid supplements are well-tolerated. Some individuals might experience mild digestive upset such as nausea, diarrhea, or stomach cramps, especially when taken on an empty stomach or in large doses. Starting with a lower dose and taking with food can often mitigate these effects.
L-Phenylalanine and L-Tyrosine can interact with certain medications, particularly MAO inhibitors, due to their role as neurotransmitter precursors. Individuals with phenylketonuria (PKU) must strictly avoid phenylalanine. Those with thyroid conditions or high blood pressure should consult a healthcare professional before taking supplements containing these amino acids.
While DL-Methionine is generally recognized as safe in typical supplement amounts, very high doses might increase homocysteine levels in some individuals. It's also advised for individuals with existing kidney or liver conditions to consult a healthcare provider. There are no well-documented significant interactions with common medications at typical supplement dosages.
BCAAs (L-Leucine, L-Isoleucine, L-Valine) can affect blood sugar levels, potentially interacting with diabetes medications. They may also affect the absorption of L-dopa, a medication for Parkinson's disease. Individuals with maple syrup urine disease (MSUD) must avoid BCAAs.
The calcium in this supplement (300mg total) can interact with certain medications, including some antibiotics (like tetracyclines and fluoroquinolones), thyroid hormones, and bisphosphonates, by reducing their absorption. It's advisable to take calcium supplements at a different time of day than these medications. High calcium intake from all sources can also lead to hypercalcemia.
Ingredients
| 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
Lysine 20.0
The 93mg of L-Lysine provided is a very low dose, unlikely to significantly impact goals like collagen formation or immune modulation, where higher gram-level doses are often utilized for therapeutic effects.
Tyrosine 15.0
The product contains only 31mg of L-Tyrosine per serving, which is a minuscule amount compared to the 500-2000mg typically used in supplements for cognitive or mood support, making its contribution to tyrosine-specific benefits negligible.
Phenylalanine 15.0
With only 32mg of L-Phenylalanine, the dose is well below what is considered effective for its role as a precursor to dopamine and norepinephrine for cognitive function or mood enhancement.
Goals
Immunity 25.0
L-Cysteine is a precursor to glutathione, an important antioxidant for immune support, and L-Lysine has roles in immune function. However, the doses of these immune-supporting amino acids are quite modest, suggesting only a very general or minimal contribution to immunity rather than a targeted immune boost.
The product includes amino acids like L-Tyrosine and L-Phenylalanine which are precursors to neurotransmitters associated with brain health, focus, mood, and productivity. However, the quantities of these specific amino acids are significantly lower than doses typically researched and recommended for noticeable cognitive benefits, making their impact negligible.
L-Cysteine and L-Methionine are crucial for keratin and collagen production, which are fundamental for healthy hair and skin. Despite their presence, the low dosages of these specific amino acids make it improbable for the product to deliver substantial or noticeable benefits for skin and hair health.