Core Nutritionals

Hard , 84 Capsules

Advanced Recomposition and Hardening Agent
Combines Five Powerful Ingredients into Recomposition Goodness!
6.0  out of 10  (5 Reviews)
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Product Overview

Your diet is impeccable and couldn’t be any more in check – macros, micros, you have it all down. Your workouts? Get out of here! You have slaved, grinded, and grunted your way through leg workouts so intense the gym staff cried – and those were on your worst days. And yet, something is missing.

It’s that “extra” level of shred, “that look.” You know exactly what we mean. That type of leanness and density that makes an arm look twice as big, a stomach look twice as lean, and a forearm look like a roadmap for the Italian countryside. It’s that kind of elusive hardness that’s so rare, most of us simply chalk it up to genetics, or luck, or whatever excuse we have handy – and yet we all still want it.

The reality? It isn’t all that unattainable. Getting “that” look, “that” hardness, is about balance and recomposition. It’s a matter of adding in that final piece of the puzzle that makes the entire picture come out perfectly.

To be hard, you need to get HARD. It’s that simple.

Core HARD is another product in the Core Nutritionals’ lineup to follow the basic, but indispensable principles that Core Nutritionals is slowly making an industry standard: create products with effective ingredients, in effective doses, in a non-proprietary formula. This time around, we have applied those principles to the problem of softness that we all despise and have developed the most advanced ultra-hardening and recomposition agent on the market.

Taking advantage of both the old and the new, Core Nutritionals has employed both modern, cutting-edge compounds and traditional herbs to create a balanced approach to delivering hardness. Key ingredients in Core HARD affect some of the body’s critical physiological pathways, combining sexiness and science in a single, non-proprietary formula. We have included five powerful ingredients into a full month's worth of stimulant free, recomposition goodness.

Core HARD can be used alone, or in a stack with other Core Nutritionals’ products. The BURN HARD stack (Core HARD plus Core BURN) will be the ultimate fat blasting and hardening stack. Men can try the HARD A.B.s stack (Core HARD plus Core ALPHA plus Core BURN) to help create that chiseled look that all men want.

Physiological Properties and Effects:

Phosphatidylserine (50%)
Phosphatidylserine, colloquially known as PS, is a nearly ubiquitous phospholipid found in various membranous tissues throughout the body. PS’s ubiquity coincides with its necessity for crucial physiological functions, as the phospholipid is supportive in several components of cell communication. In a fitness-related context, a nascent but growing body of methodologically-sound research suggests that PS may support stress response, with a resulting increase in total exercise capacity and performance.*

While several explanations exist as to PS’s specific mechanism of action, one of the earliest proposals was a powerful and acute blunting effect on cortisol production via ACTH (adrenocorticotropic hormone) reduction. In a double-blind study involving 9 healthy adult males, ranging in age from 18-29, the participants were administered phosphatidylserine for 10 days prior to an acute exercise challenge. Post-exercise measurements found that phosphatidylserine reduced not only ACTH, but also supports plasma cortisol levels in a statistically significant fashion within a normal range.*

Subsequent studies administering the compound in both acute and chronic fashion suggest that PS, whether through cortisol-mediated mechanisms or otherwise, has a measurable effect on exercise physiology and exercise capacity. In a double-blind, placebo-controlled, randomized trial involving 16 trained athletes, phosphatidylserine was administered for 10 days prior to an acute exercise challenge. Biomarkers of stress and muscle damage (cortisol, creatine kinase, among them), along with exercise markers such as exercise time to exhaustion, sprint performance, and ratings of perceived exertion, were measured post-exercise. While PS administration did not attenuate markers of physiological stress in this study, the authors found that exercise time to exhaustion was significantly altered.* Related studies using similar serving sizes have found that chronic PS administration increased shot accuracy in golfers, increased exercise time to exhaustion by 28% in cyclists, and reduced subjective feelings of stress and soreness in others.*

Overall, and whether by cortisol or non-cortisol mediated mechanisms, phosphatidylserine appears to play a valuable role in the reduction of both physiological and psychological stress in response to exercise.* In combination with its demonstrated effects on exercise capacity improvement, PS may play a critical role in the continued exercise success of bodybuilders in a, “cutting” or recomposition stage.

KSM-66® Full-spectrum Ashwagandha root extract (5% Withanolides)
Withania somnifera Dunal, colloquially known as Winter Cherry or Indian Ginseng, is an herb that features prominently in the traditional Indian medicinal system of Ayurveda. Known as Ashwagandha in Ayurveda, Withania somnifera is a critical ingredient in various Ayurvedic tonics and tinctures.

Recently identified as a potent adaptogenic and target for therapeutic applications, Ashwaghanda has been the subject of numerous animal and clinical trials designed to examine its potential effects as an antioxidant. Ashwaghanda’s broad potential is hypothesized to be the result of its robust phytochemical profile, including a wide swath of alkaloids, sitoindosides, and the highly biologically active withanolide group. As the principally biologically active compounds within Ashwaghanda, withanolides such as withanone, withaferine A, withanolides A, D, and G have been identified, isolated, and extensively studied in the various applications noted above.*

In recognition of the potential physiological benefits of withanolides, Core Nutritionals selected KSM-66® to include in its HARD formula. KSM-66® is a full-spectrum Ashwaghanda extract, standardized for 5% withanolides – meaning that KSM-66® not only includes the full range of biologically active compounds within Ashwaghanda, but also that it contains the highest currently available concentration of the principally active withanolides (5%).*

The high concentrations of withanolides within KSM-66® has resulted in encouraging results in a number of human, clinical trials – particularly considering many of these trials were conducted using the methodological gold standard of randomization, double-blind delivery, and placebo control. Amongst the most impressive results contained in these trials:

  • A 27.9% reduction in serum cortisol levels, measured over 60 days in a trial featuring 64 adults.*
  • Statistically significant increases to endurance and stamina, as measured by VO2 max, in a clinical trial featuring 50 healthy, exercise-trained adults.*
  • Increased measures of well-being as reported by self-assessment scales, included in both the clinical trials mentioned above.*
  • Statistically significant increases in serum testosterone levels in a clinical trial featuring 68 men.*

To put it the simplest way possible, cortisol’s chief functions involve supporting the very things we as fitness enthusiasts want to avoid or turn on, respectively!

N-Coumaroyldopamine is a natural analogue to the phytochemical N-Caffeoyldopamine, itself found prominently in various plants, including cocoa (Theobroma cacao L.). N-Coumaroyldopamine, its parent compounds, and other analogs that derive from its parent compound, have recently been the subject of phytochemical analyses due to their chemical similarity to sympathomimetic amines known to couple to the beta-2-adrenergic receptor.

The desirability of activating the beta-2-adrenergic receptor arises due to the critical role that beta-2-adrenertic receptors play in both skeletal muscle and fat metabolic function. In particular, beta-2-adrenergic receptors have been shown to induce dilation in the vasculature (vasodilation – the process involved in a “pump”), increase oxygen uptake and nutrient transport to skeletal muscle, regulate thermogenesis (the production of body heat), inhibit the pro-adipogenic (fat constructing) effects of other adrenergic receptor types, as well as directly increase lipolysis and the oxidation of fatty acids – the literal burning of fat tissue.

Beta-2-adrenergic receptors achieve these effects via one of the body’s key chemical messengers, known as cAMP (cyclic adenosine monophosphate). cAMP works as a sort of cell-type translator and foreman: it receives an input from, say, a receptor such as the beta-2-adrenergic receptor, and then communicates and directs the types of cells that the beta-2-adrenergic receptor would like to target.

Just within the context of beta-2-adrenergic agonism, this amounts to cAMP increasing resting metabolic rate and caloric expenditure (the amount of calories you burn), induction of AMPk (adenosine monophosphate kinase) release, triggering of lipolysis (the literal burning of fat tissue we spoke about earlier), the support in a reduction of lipogenesis (the creation of fat tissue), and vasodilation.*

Or, in other words, cAMP is involved in nearly every beneficial physiological process that a lifter, runner, hiker, jumper, runner, tumbler, and fumbler would want. cAMP is involved in:

  • Support bloodflow (“pump”).*
  • Reduce muscle protein usage (catabolism).*
  • Support muscle protein synthesis.*
  • Promote adipose utilization.*

To say that cAMP is a desirable compound to increase the release of – which activating the beta-2-adrenergic receptor does – would qualify as the understatement of the year!

3,3'-Diindolylmethane (DIM)
What we typically refer to as “Estrogen,” is in fact a group of three biologically distinct hormones – estradiol (E2), estrone (E1), and estriol (E3), each possessing different activities in different cell, tissue, and receptor types. When experts refer to either the benefits or downfalls of “estrogen," they really mean to (but probably cannot) identify a specific estrogen.

These specific estrogens, in turn, metabolize into even more specific estrogen sub-compounds, such as the 2-hydroxyestrogens (2-OHE’s), 2-methoxyestrogens, 16a-hydroxyestrone (16-OHE1), and 4-hydroxyestrogens (4-OHE’s). As their parent estrogens, these estrogen metabolites exert different effects depending upon the tissue and cell one is examining. In fact, two estrogen metabolites in particular, 16-OHE1 and 2-OHE, have such contrasting cellular activities that 2-OHE is an estrogen antagonist. Yes, that is correct: there is an estrogen that helps support a healthy estrogen balance.*

In recent years, so-called “phytonutrients” have become the focus of clinical research, as these natural compounds have shown the ability to increase the ratio of good, estrogen decreasing estrogens (such as 2-OHE), to bad, estrogen increasing estrogens (such as 16-OHE1). One of these phytonutrients, a dietary indole known as indole-3-carbinol (I3C).

Luckily, however, I3C readily metabolizes into the secondary indole 3,3’ diindolylmethane, or DIM for short. When used in a supplemental fashion in clinical trials, DIM appears to possess all the positive effects of its parent compound– promoting the metabolism of beneficial estrogens to support a healthy estrogen balance.*

Aside from its healthy-estrogen promoting abilities, DIM also exerts its own direct physiological effects, including:

  • Promoting pathways of metabolism that favour a healthy estrogen to testosterone balance already within a normal range.*

Despite the bodybuilding community’s single-minded crusade to eliminate estrogen wherever it lie in wait, compounds such as DIM show us that estrogen is a very diverse set of compounds – and that we should actively pursue increasing certain estrogens that have beneficial effects.*

Though the literature surrounding L-theanine is still emerging, the amino acid is slowly building a reputation as one of the most interesting and exciting compounds being targeted for therapeutic use. L-theanine is an amino acid found almost exclusively in tea, constituting approximately 1-2% of the dry weight of tea – resulting in a 25–60 mg theanine load per 200 ml serving of liquid tea.

First identified in green tea and in the mushroom Xerocomus badius, L-theanine readily crosses the blood-brain barrier in a dose-dependent manner, and it is thought to influence the central nervous system (CNS) through a variety of mechanisms, including:

  • Supporting the release and concentration of dopamine.*
  • Reducing glutamate reuptake.*
  • Promoting gamma-aminobutyric acid (GABA – a neurotransmitter associated with the regulation of responses) concentrations.*
  • Supporting levels of serotonin already within a normal range.*

In addition to these more well-demonstrated effects, emerging electroencephalography trials on theanine suggest that the amino acid may exert a positive effect on alpha waves – a type of brain wave implicated in restful relaxation. Alpha activity has also been associated with increased creativity, increased performance under stress, and improved learning and concentration, as well as relaxation.*


Kingsley M, Wadsworth D, Kilduff LP, McEneny J, Benton D; Wadsworth; Kilduff; McEneny; Benton (August 2005). "Effects of phosphatidylserine on oxidative stress following intermittent running". Medicine and Science in Sports and Exercise 37 (8): 1300–6.

Kingsley MI, Miller M, Kilduff LP, McEneny J, Benton D; Miller; Kilduff; McEneny; Benton (January 2006). "Effects of phosphatidylserine on exercise capacity during cycling in active males". Medicine and Science in Sports and Exercise 38 (1): 64–71.

Jäger R, Purpura M, Geiss K-R, Weiß M, Baumeister J, Amatulli F, Schröder L, Herwegen H; Purpura; Geiss; Weiß; Baumeister; Amatulli; Schröder; Herwegen (December 2007). "The effect of phosphatidylserine on golf performance". International Society of Sports Nutrition 4 (1): 23.

Starks MA, Starks SL, Kingsley M, Purpura M, Jäger R; Starks; Kingsley; Purpura; Jäger (July 2008). "The effects of phosphatidylserine on endocrine response to moderate intensity exercise". Journal of the International Society of Sports Nutrition 5 (1): 11.

Monteleone P, Maj M, Beinat L, Natale M, Kemali D; Maj; Beinat; Natale; Kemali (1992). "Blunting by chronic phosphatidylserine administration of the stress-induced activation of the hypothalamo-pituitary-adrenal axis in healthy men". European Journal of Clinical Pharmacology 42 (4): 385–8. doi:10.1007/BF00280123 (inactive 2015-02-01). PMID 1325348.

Fernholz KM, Seifert JG, Bacharach DW, Burke ER, Gazal O (2000). "The Effects of Phosphatidyl Serine on Markers of Muscular Stress in Endurance Runners [abstract]". Medicine and Science in Sports and Exercise 32 (4): S321.

Bhattacharya SK, Muruganandam AV. Adaptogenic activity of Withania somnifera: An experimental study using a rat model of chronic stress. Pharmacol Biochem Behav 2003;75:547-55.

Singh G, Sharma PK, Dudhe R, Singh S. Biological activities of Withania somnifera. Ann Biol Res 2010;1:56-63.

Sharma V, Sharma S, Pracheta, Paliwal R. Withania somnifera: A rejuvenating ayurvedic medicinal. Int J PharmTech Res 2011;3:187-92.

Kulkarni SK, Dhir A. Withania somnifera: An Indian ginseng. Prog Neuro-Psychopharmacol Biol Psychiatry 2008;32:1093-05.

Bhattacharya SK, Goel RK, Kaur R, Ghosal S. Antistress activity of sitoindosides VII and VIII, new acylsterylglucosides from Withania somnifera. Phytother Res 1987;1:32-7.

Ghosal S, Lal J, Srivastava R, Bhattacharya SK, Upadhyay SN, Jaiswal AK, et al. Immunomodulatory and CNS effects of sitoindosides IX and X, two new glycowithanolides from Withania somnifera. Phytother Res 1989;3:201-6.

Park, JB. N-coumaroyldopamine and N-caffeoyldopamine increase cAMP via beta 2-adrenoceptors in myelocytic U937 cells. FASEB J. 2005 Apr;19(6):497-502.

St-Onge. Dietary fats, teas, dairy and nuts: potential functional food for weight control? Am J Clin Nutr 2005 81(1):7-15.

Kuriyama S et al. Green Tea Consumption in Japan The Ohsaki Study. JAMA 2006;296:1255-1265.

Coimbra S et al. Green tea consumption improves plasma lipid profiles in adults. Nutrition Research 2006;26(11): 604-607.

Bryan J. Psychological effects of dietary components of tea: caffeine and L-theanine. Nutr Rev 2008;66(2):82-90.

Nobre AC, Rao A, Owen GN. L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pac J Clin Nutr 2008;17 Suppl 1:167-8.

Kimura K, Ozeki M, Juneja LR, Ohira H. L-Theanine. Biol Psychol 2007;74(1):39-45.

L-theanine. Monograph. Altern Med Rev 2005;10(2):136-8.

Dulloo AG, Duret C, Rohrer D, Girardier L, Mensi N, Fathi M, Chantre P, Vandermander J. Efficacy of a green tea extract rich in catechin polyphenols and caffeine in increasing 24-h energy expenditure and fat oxidation in humans. Am J Clin Nutr 1999;70(6):1040-5.

Hertog MGL, Feskens EJM, Hollman PCH, et al. Dietary antioxidant flavonoids Zutphen Elderly Study. Lancet 1993;342:1007-11.

Keli SO, Hertog MGL, Feskens EJM, Kromhout D. Dietary flavonoids, antioxidant vitamins. Arch Intern Med 1996;156:637-42.

Duffy SJ, Keaney JF Jr, Holbrook M, Gokce N, Swerdloff PL, Frei B, Vita JA. Short- and long-term black tea consumption. Circulation 2001;104:151-6.

Isemura M, Saeki K, Kimura T, Hayakawa S, Minami T, Sazuka M. Tea catechins and related polyphenols as anti-cancer agents. Biofactors. 2000;13(1-4):81-5.

Hakim IA, Alsaif MA, Alduwaihy M, Al-Rubeaan K, Al-Nuaim AR, Al-Attas OS. Tea consumption and in Saudi adults: results from a Saudi national study. Prev Med 2003;36(1):64-70.

Sesso HD, Gaziano JM, Buring JE, Hennekens CH. Coffee and tea intake and the risk of myocardial infarction. Am J Epidemiol 1999;149:162-7.

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Ho GH. Luo XW. Ji CY. Foo SC. Ng EH. Urinary 2/16alpha-hydroxyestorne ratio: correlation with serum insulin-like growth factor binding protein-3. Ann Acad Med Singap. 1998;27:294–299.

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Ratings & Reviews

Overall Rating
5 Ratings
Verified Buyer Rating
3 Ratings
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Aug 07, 2017
Verified Buyer

Doesn't do anything. Noticed no difference. Used for a few cycles and was highly disappointed. Core Nutritionals started off as a company touring that they are not like all the big companies. But now they are just out to make money. The CEO is incredibly immature in all his videos and advertising that he puts out. Definately doesn't give the impression its a company you want to use. Dont waste your money on this product or any other overpriced worthless Core Nutritional product.

Mar 18, 2017

I loved Core Hard. I've been taking it since it pretty much came out on the market and it does what it promises. It definitely reduces cortisol levels as whenever I take it I feel very calm and laid back with reduced overall daily stress. Another excellent benefit is improved and deep sleep. Core Hard however shines in the hardness department. After the first 4-5 days you notice your skin is tighter and your muscles appear fuller and more vascular. For someone who wants that extra edge with their fat loss efforts, without getting soft, this is a really good product. I recommend stacking it with Core Alpha as well.

Nov 30, 2016

did not notice any added benefits of taking this while losing weight and trying to get shredded.. honestly it is a bogus product and you should invest your money in other things.

Jun 13, 2016
Verified Buyer

I didn't know what to expect with this product but thought I'd give it a try anyway. First things first, I will say that if you're the type of person who doesn't drink a lot of water then this is NOT the product for you. I typically consume a gallon of water a day, if not more, and after about a week of taking these with GAT Testrol I started getting nasty headaches and felt dehydrated constantly. I decided to finish with the Testrol first and then come back to this and it seemed to clear things up for me. I followed the directions and I was quite happy with the results. I made it through the entire bottle and my muscles definitely gained density and hardness. I became more vascular and noticed definition I hadn't achieved before. I don't think its something I'd take on a regular basis because I'm just a simple dad and husband and don't do shows or make it to the beach very often but for anyone looking to add some of those all important veins and definition then, certainly, give it a try. Easy to follow instructions, easy to swallow, and not overly expensive. Just depends on what your goals are.

Sep 22, 2015
Verified Buyer

This product really helped me to get shredded.

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Combines Five Powerful Ingredients into Recomposition Goodness!

What's in Core Nutritionals Hard

Serving Size: 3 Capsules
Servings Per Container: 28 (days)
Amount Per Serving % DV
Phosphatidyl Serine 500mg
KSM-66® Full-spectrum Ashwagandha root extract (5% Withanolides) 600mg
N-Coumaroyldopamine 40mg
3,3'-Diindolylmethane (DIM) 200mg
L-Theanine 300mg
† Daily Value (DV) not established.
Other Ingredients:
Brown Rice Flour, Magnesium Stearate, Hypromellose.

Directions For Hard: Take 1 capsule 2-3 times per day. For optimal results, take 1 capsule upon waking, 1 capsule mid day, and 1 capsule before bed. Do not exceed 4 capsules in a 24 hour period. For best results, use for 4 to 8 weeks. Do not use for longer than 8 continuous weeks without taking a 4 week break.  

Warnings: This product is only intended for use in healthy adults 18 years of age or older. Pregnant or nursing women should not use this product. Consult your healthcare provider before using this product, especially if you are taking any prescription, over the counter medication, dietary supplement product, or if you have any pre-existing medical condition including but not limited to: high or low blood pressure, cardiac arrhythmia, stroke, heart, liver, kidney or thyroid disease, seizure disorder, psychiatric disease, diabetes, difficulty urinating due to prostate englargement or if you are taking a MAOI (Monoamine Oxidase Inhibitor) or any other medication. Discontinue use and consult your health care professional if you experience adverse reaction to this product. Discontinue use 2 weeks prior to surgery. Do not exceed recommended serving. Do not use if safety seal is broken or missing. Keep out of reach of children.

* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
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