D-Aspartic (D-Asp) is one of the non-essential amino acid mostly found in brain tissue. It plays a key role in the production of many other amino acids and nucleic acids (DNA, RNA, etc). [1]

It is usually found in brain tissue and gonads, it is said to play a key role in the nervous system and neuroendocrine system. [2] [3]

Recently D-aspartic acid has gained a lot of hype as a gym supplement it is being promoted as a testosterone booster for improving athletic performance.

How does D Aspartic Acid Work?

D-asp acid found in the brain acts like a neurotransmitter, they are chemical messengers of the body. [4] [5]

Research showed that D-asp is also found in hypothalamus and testes where it is utilized in the production of hormones like testosterone and luteinizing hormone. [6] [7] [8]

In a study, it was demonstrated that D-asp in the boar testes helps in increased production of oestrogen hormone. Similar action was also demonstrated in lizard testes. [9] [10] [11]

Comparison of Top Aspartic Acid Supplements

Here is a quick comparison of the top supplements available in the market for you –

ProductContentServingPrice

BulkSupplements D-Aspartic Acid Powder

BulkSupplements D-Aspartic Acid (DAA) Powder (250 grams)

1,500+ Reviews, Best in Powder

100 tbs 2,500 Mg per Serving

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Nutricost D-Aspartic Acid

Nutricost D-Aspartic Acid Capsules, (DAA) 180 Capsules - 3000mg Serving

Best in Capsules

180 Capsules 750 Mg per Capsule

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Nutricost D-Aspartic Acid Powder

Nutricost D-Aspartic Acid (DAA) Powder 300G (Blue Raspberry) - High Quality D-Aspartic Acid

100 Scoops 3,000 Mg per Serving

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Biotech Nutritions D-Aspartic Acid

Biotech Nutritions D-Aspartic Acid Dietary Supplement, 3000  mg., 200 Count

200 Capsules 3,000 Mg per Capsule

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Pure D-Aspartic Acid Powder

Pure D-Aspartic Acid (DAA) Bulk Powder (100 Grams)

40 tbs 2,500 Mg per Serving

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Reviews of the Best D Aspartic Acid

Here are reviews of some of the good Aspartic acid supplement available in the market today.

Bulk Supplements D-Aspartic Acid Powder 250grams

BulkSupplements D-Aspartic Acid (DAA) Powder (250 grams)

Bulk Supplements ranks high among the major producers of dietary supplements.

The nutrition company has a portfolio of over 400 products and is based in Nevada, United States. This is one of the best aspartic acid supplements available in the market.

One tablespoon of this powder offers about 3000mg of 100% pure D-aspartic acid, containing no GMOs, fillers or gluten.

It boosts energy levels, increases testosterone production and release, and enhances athletic performance.

It is proudly made in the USA and lab-tested for purity and quality.

Key constituents of the supplements – 

BulkSupplements D-Aspartic Acid (DAA) Powder (250 grams)

Pros and Cons

  • Blends in well
  • Contains no gluten or GMOs
  • Good price
  • Raises testosterone and energy levels
  • Bitter taste

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Nutricost 750mg D-Aspartic Acid Capsules

Nutricost D-Aspartic Acid Capsules, (DAA) 180 Capsules - 3000mg Serving

Based in the United States, Nutricost is a popular supplement brand offering a wide range of health-promoting products like GABA powder, L-theanine, apple cider vinegar, etc. at affordable prices.

Nutricost brings you high-quality D-aspartic acid in its easy-to-take, encapsulated form.

Each serving delivers 3000mg of D-AA, a non-essential amino acid that is found in egg, milk, etc.

This supplement can help boost testosterone levels, improve fertility and increase energy and strength.

One capsule offers 750mg of pure D-aspartic acid, containing no fillers, gluten, or GMOs.

Key constituents of the supplements – 

Nutricost D-Aspartic Acid Capsules, (DAA) 180 Capsules - 3000mg Serving

Pros and Cons

  • Easy to swallow
  • Non-GMO
  • It is an energy booster
  • Great price
  • Some users complained that it gave them headaches
  • Had no effect on some people

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Biotech Nutrition D-Aspartic Acid 200 Capsules

Biotech Nutritions D-Aspartic Acid Dietary Supplement, 3000  mg., 200 Count

Biotech Nutrition is one of the leading providers of health and nutritional supplements.

The company claims that all their products are manufactured in an FDA-registered facility and according to current GMP standards.

Take your testosterone and energy levels a step beyond with Biotech Nutrition D-aspartic acid.

Offering 3000mg per serving, this supplement gives you the right quantity of aspartic acid the body needs for optimal reproductive functioning.

D-aspartic acid, D-AA, is a non-essential amino acid that plays a key role in the release of several hormones such as FSH (follicle stimulating hormone) and LH (luteinizing hormone).

This supplement also enhances performance, increases strength and improves fertility.

Each bottle contains 200 capsules of pure D-AA with no fillers, preservatives, gluten or GMOs.

Key constituents of the supplements – 


Biotech Nutritions D-Aspartic Acid Dietary Supplement, 3000 mg., 200 Count

Pros and Cons

  • Easy to take
  • Free of gluten, GMOs, or fillers
  • Reasonably priced
  • Boosts testosterone and energy levels
  • Not effective for everyone

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Nutricost D-Aspartic Acid Powder 300g

Nutricost D-Aspartic Acid (DAA) Powder 300G (Blue Raspberry) - High Quality D-Aspartic Acid

This is another high-quality D-aspartic acid supplement from Nutricost. It is a 100-percent pure powder of D-aspartic acid (D-AA), which can help raise the level of testosterone in the body.

This supplement also increases energy levels, boosts performance and improves reproductive health.

It is devoid of gluten, GMOs, and preservatives and offers 1gram of D-AA per serving.

Key constituents of the supplements – 

Nutricost D-Aspartic Acid (DAA) Powder 300G (Blue Raspberry) - High Quality D-Aspartic Acid

Pros and Cons

  • Mixes well
  • No gluten or GMOs
  • It is effective
  • Not expensive
  • Not so good taste

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Noble Elephant Supplements Pure Aspartic Acid Powder 100g

Pure D-Aspartic Acid (DAA) Bulk Powder (100 Grams)

Noble Elephant Supplements is a renowned nutrition company that takes pride in offering a large collection of health products such as amino acids, vitamins, herbals, supplements, and so on.

This D-aspartic acid powder is pure and unflavored, containing no fillers, GMOs or common allergens.

Also referred to as D-aspartate, D-aspartic acid is crucial for the development of CNS (central nervous system) and optimal functioning of the endocrine system.

This dietary supplement increases muscle strength, boosts testosterone levels, and supports metabolic functions.

It comes in a resealable stand-up pouch to keep out contaminants and maintain the freshness.

A Quick Preview of Supplement Details of the Product

Pure D-Aspartic Acid (DAA) Bulk Powder (100 Grams)

Pros and Cons

  • Easy to mix
  • It is 100-percent pure
  • Good price
  • No flavor
  • Not effective for some users

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Benefits of Aspartic Acid

1. May Boost Testosterone Levels

There are some mixed results from all the studies done on humans so far. Some studies showed that D-aspartic acid can increase testosterone, levels only in healthy men with little to no exercise for only a short period of time. But prolonged usage is associated with both an increase and no significant change. More human studies are needed.

Confidence level: High

In a study conducted in 23 healthy men aged between 27–37 years, 20 of these men showed that taking D-aspartic acid helped approximately 42% increase in their testosterone levels after only 12 days of supplementation. [12]

Likewise, another study conducted in obese and overweight men supplemented with D-aspartic acid for 28 days showed mixed results.

Only those men with lower testosterone at the beginning of the study experienced an increase in their testosterone levels. However other men did not show any increase. [13]

In another study healthy men aged between 27–43 years, took D-aspartic acid supplements for 90 days; most of them experienced a 30–60% increase in their testosterone levels. [14]

On the contrary, a study reported no increase of testosterone levels in weight lifting adult men taking D-aspartic acid for 28 days. [15]

Also, another study found that taking 6 grams of the D-aspartic acid supplement per day for two weeks actually decreased the testosterone levels in young men who weight train. [16]

Benefits of Aspartic Acid

2. May Help Increase Sperm Quality

D-Aspartic acid has claimed to increases testosterone levels and other sex hormones in some animal studies as well as in healthy adult male. [17] Thus scientists proposed that consuming aspartic acid supplements or foods rich in it can help improve the sperm mobility and quantity in infertile men. Although more human research is needed.

Confidence level: High

In the studies conducted in different animals like male rabbits, rooster, and rats, a mixture of both L-Aspartic acid and D-Aspartic acid supplements helped increase the number, speed, and mobility of their sperms. [18] [19] [20] [21]

Similar results were also observed in a human trial, infertile men had much lower levels of aspartic acid in mature sperms and semen than found in fertile men according to a study.[22]

In another study 60 men with low sperm count and/or poor mobility of sperm, showed an increase in their sperm counts and improved mobility after taking D-Aspartic acid supplements approximately 2.5 grams daily for 90 days. 26 out of 60 participants had positive pregnancy. [23]

One study shows that treating sperm with the mixture of D-Asp, zinc, and CoQ10 (coenzyme Q10) together improves the swimming and mobility of human sperms used for in-vitro fertilization (IVF). This mixture also prevented damage to sperm DNA and lipids during IVF. [24] [25] [26] [27]

3. May play a Role in Female Fertility

Recently scientists proposed that D-aspartic acid may also play a role in ovulation in women. Several animal studies show that the quality of ovum (female egg) may be influenced by D-Aspartic acid naturally present in the follicular fluid.

Confidence level: Low

Several animal studies confirm that D-aspartic acid plays a key role in onset of puberty and ovaries maturation. [28] [29] [30] [31] [32]

One study in human females has shown that levels of aspartic acid in follicular fluid in the ovaries declines with increasing age. [33]

Scientists believe that this decline in aspartic acid is linked to the poor egg quality and increase in numbers of unsuccessful pregnancies for aging women. [34] [35]

D-aspartic acid may improve egg quality by influencing growth hormone, prolactin, oestrogen, progesterone, nitric oxide, amino acids, and proteins. [36] [37] [38]

4. Aspartic acid may help boost mental health

Experiments so far suggest that D-aspartic acid when orally ingested can work as a mental health enhancer and memory booster.

Confidence level: Low

D-aspartic acid is associated with nervous system development where it carries out important physiological functions. [39]

In an animal study, 40mM Sodium-D-Aspartate given daily for 12-16 days showed an enhanced neuronal function and memory in rats. [40]

Similarly, one human study also showed increased levels of an enzyme D-amine oxidase (DAO) that help boost memory and thought processes. [41] [42]

Dosage

One study used 2.66 grams of supplements daily for 90 days without any reported side-effects. [43]

On the contrary, two separate studies reported a decrease in the testosterone levels in healthy adult males taking 6 grams of D-Asp daily for two weeks. [44] [45]

Precautions

So far no harmful side-effects in humans consuming dietary D-Aspartic acid supplements are reported.

Due to restricted information and research D-aspartic acid supplements are not recommended in otherwise healthy women, pregnant women, lactating women, and children.

It is always advisable to consult a doctor or an expert before starting this or any other dietary supplements.

Drug Interactions

According to Drug Bank that is an all-inclusive online scientific database, drug interaction information for D-Asp is “Not Available”. [46]

Does D aspartic acid increase oestrogen?

Animal research shows that D-aspartic acid can both decrease and increase both testosterone and oestrogen levels depending on their respective concentration. It can convert testosterone to oestrogen when there is a higher concentration of testosterone in order to balance their ratios.

Thus, it does not directly affect the oestrogen level but only acts to decrease or level up the concentration of testosterone.

In the end..

D Aspartic Acid may prove to be helpful in many cases.

There are several supplement brands available in the market and thus, we have selected the good ones based on various parameters.

Here is the list of top brands again for you. Use the links to check specs, reviews, and price on Amazon –

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