Synephrine During Bulking: Is It Worth It

Synephrine is usually associated with cutting, but it can often be found in pre-workout formulas that people take all year round. Does it make sense to take this thermogenic while gaining muscle mass? The editorial team examined two common scenarios and explains why in most cases the answer is no.

The goal of bulking and the logic of a fat burner

Gaining muscle mass, or “bulking,” is built on the opposite logic to cutting. For muscles to grow as efficiently as possible, a person trains with progressive overload, consumes enough protein and, as a rule, maintains a small caloric surplus. The review by Iraki and colleagues on nutrition for bodybuilders in the off-season recommends exactly a moderate rather than an excessive surplus.

Synephrine is positioned as a thermogenic — a substance that slightly increases energy expenditure and shifts fuel use toward fats. For cutting, such an action looks logical. But during bulking it actually works against the main task: a person is trying to obtain more energy, while the supplement, if it works at all, slightly increases its expenditure.

Hence the natural question: does it make any sense at all to take synephrine during a mass-gaining phase? The answer depends on exactly what a person wants to use it for — as a “fat burner” to gain “clean” mass, or as a component of a pre-workout formula for energy during training.

The editorial team examines both scenarios separately, relying on the available research, and explains why in most cases synephrine during bulking is a redundant element.

Scenario one: “lean mass” with the help of a thermogenic

The popular idea is to take a fat burner during bulking so that fat does not accumulate along with muscle. The problem is that the amount of fat deposited during a gaining phase is determined primarily by the size of the caloric surplus, not by the presence of a stimulant in the diet.

The effect of synephrine on resting energy expenditure, according to studies summarized by Stohs and colleagues, is measured in tens of kilocalories per day. The same result is achieved by cutting a portion by a couple of spoonfuls of porridge. Controlling the surplus through diet is far more precise and cheaper than through a supplement.

In addition, some people report reduced appetite while taking stimulants. For someone who already struggles to eat enough, this is an undesirable effect: the supplement may interfere with meeting the nutrition plan, and therefore with gaining mass.

Finally, prolonged daily use of stimulants during bulking means that by the time of cutting the body will already be accustomed to them, and the subjective “alertness” from the thermogenic at the moment it is needed will be weaker.

Scenario two: synephrine as a pre-workout component

The second scenario is synephrine as part of a pre-workout formula for energy and focus during training. Here the question is not about fat but about performance: does synephrine help lift more, do more repetitions or train more intensely.

The study by Ratamess and colleagues assessed the effect of synephrine on its own and together with caffeine on resistance training. Certain measures, in particular the number of repetitions and training volume, improved primarily in the group that received the combination of synephrine with caffeine. The contribution of synephrine alone was less convincing.

In the work of Gutiérrez-Hellín and colleagues on sprinters, a single dose of p-synephrine did not improve sprint performance. Therefore synephrine cannot be considered an ergogenic aid for strength or speed work.

Caffeine, by contrast, has a well-documented evidence base: the position of the International Society of Sports Nutrition (ISSN) on caffeine confirms its ability to improve various types of physical performance. So if a person is looking for a stimulant for training during bulking, caffeine has a much stronger justification than synephrine.

When synephrine during bulking is especially inappropriate

There are situations in which taking synephrine during a mass-gaining phase is not just of little use but actually undesirable. The editorial team highlights the following cases:

• a person has a low appetite and struggles to reach the required calorie intake;
• training takes place in the evening, and stimulants worsen sleep, on which recovery depends;
• a lot of caffeine is already being consumed from coffee, energy drinks and pre-workout formulas;
• there is elevated blood pressure, heart rhythm disturbances or thyroid disease;
• a person is taking antidepressants or other medications with possible interactions.

Sleep during bulking deserves a separate mention. It is precisely during sleep that a significant part of recovery takes place, and its chronic lack worsens strength performance and appetite regulation. A stimulant taken before a late workout can imperceptibly “eat away” at the results of the gaining phase.

Athletes who undergo doping control should also keep product quality in mind. Synephrine is not banned by WADA but is on the Monitoring Program, and low-quality pre-workout formulas may contain undeclared banned stimulants.

So in most cases the decision “not to add synephrine” during bulking is both simpler and safer.

What actually works during bulking

The foundation of gaining mass is well known and supported by the ISSN reviews on sports nutrition. It is systematic strength training with progressive overload, sufficient protein intake, a moderate caloric surplus and quality recovery.

Among supplements, the best-justified one for gaining strength and mass remains creatine monohydrate. Protein products are useful as a convenient source of protein when it is hard to obtain from regular food. Caffeine may be appropriate as a pre-workout stimulant for those who tolerate it well.

Synephrine has no clear niche in this lineup. If a person already uses a pre-workout formula that contains synephrine and tolerates it well, that is not critical. But there are no compelling grounds to buy synephrine specifically for gaining mass.

It is more logical to leave thermogenics for the cutting phase, if they are needed at all, and to use them deliberately, taking contraindications into account.

Editorial conclusions

Synephrine is designed as a thermogenic, and gaining mass requires a caloric surplus, so during bulking its main action at least does not help, and in people with a weak appetite it may even interfere.

As a pre-workout component, synephrine has a weak evidence base: noticeable effects in studies appeared mostly in combination with caffeine, while caffeine on its own has a much stronger justification.

For gaining mass, the priorities are training, protein, a moderate surplus, sleep and, optionally, creatine.

We also recommend reading our articles “Synephrine During Cutting: Does It Help,” “Synephrine and Sleep” and “Synephrine After 40.”

References

1. Iraki J, Fitschen P, Espinar S, Helms E. Nutrition recommendations for bodybuilders in the off-season: a narrative review. Sports (Basel). 2019;7(7):154.
2. Kerksick CM, Wilborn CD, Roberts MD, et al. ISSN exercise & sports nutrition review update: research & recommendations. J Int Soc Sports Nutr. 2018;15(1):38.
3. Ratamess NA, Bush JA, Kang J, et al. The effects of supplementation with p-synephrine alone and in combination with caffeine on resistance exercise performance. J Int Soc Sports Nutr. 2015;12:35.
4. Gutiérrez-Hellín J, Salinero JJ, Abían-Vicen J, et al. Acute consumption of p-synephrine does not enhance performance in sprint athletes. Appl Physiol Nutr Metab. 2016;41(1):63–69.
5. Guest NS, VanDusseldorp TA, Nelson MT, et al. International society of sports nutrition position stand: caffeine and exercise performance. J Int Soc Sports Nutr. 2021;18(1):1.
6. Stohs SJ, Preuss HG, Shara M. A review of the human clinical studies involving Citrus aurantium (bitter orange) extract and its primary protoalkaloid p-synephrine. Int J Med Sci. 2012;9(7):527–538.