Vegan bodybuilders need about 1.6 to 2.2 g of protein per kg of body weight a day (roughly 0.7 to 1.0 g per pound), spread over 3 to 6 meals, plus 10 to 20% more calories than maintenance when bulking. Add creatine (3 to 5 g a day) and a reliable B12 source, and plant protein builds muscle as well as animal protein does when the totals match.
That last point has direct evidence. In a 12-week trial, habitual vegans and omnivores eating the same 1.6 g/kg of protein gained the same 1.2 kg of leg lean mass on average.
Key takeaways
- Protein: 1.6-2.2 g/kg a day, about 0.4-0.55 g/kg per meal.
- Calories: 10-20% above maintenance; gain about 0.25-0.5% of body weight a week.
- Source matters less than amount. Soy and pea protein matched whey in muscle gain when protein was matched.
- Supplements with the best case: creatine, vitamin B12, and often vitamin D, iodine and algae omega-3.
- Track it. Plant proteins come with carbs and fiber, so portions need to be bigger than you'd guess.
Can you build muscle on a vegan diet?
Yes. Two randomized trials make the case:
- Hevia-Larraín 2021: 19 vegan and 19 omnivorous young men trained for 12 weeks with protein topped up to 1.6 g/kg a day, soy for the vegans and whey for the omnivores. Both groups gained the same leg lean mass and muscle size, with no difference in strength.
- Babault 2015: 161 men trained for 12 weeks taking 25 g of pea protein, whey or a placebo twice a day. Biceps thickness gains were not different between pea and whey. Pea beat placebo only in the subgroup who started weakest; across everyone, the group difference was a trend.
Plant proteins do have, on average, a little less leucine and fewer essential amino acids per gram than whey. Eating enough total protein closes that gap. A protein-supplementation meta-analysis (Morton 2018) found muscle gains leveled off around 1.6 g/kg a day, which is why the range below starts there.
How much protein vegan bodybuilders need
A review of off-season bodybuilding nutrition (Iraki 2019) recommends 1.6-2.2 g/kg a day, split evenly across 3-6 meals at about 0.4-0.55 g/kg each. The International Society of Sports Nutrition gives 1.4-2.0 g/kg for most people who train.
| Body weight | 1.6 g/kg (g/day) | 2.0 g/kg (g/day) | 2.2 g/kg (g/day) |
|---|---|---|---|
| 150 lb (68 kg) | 109 | 136 | 150 |
| 180 lb (82 kg) | 131 | 163 | 180 |
| 200 lb (91 kg) | 145 | 181 | 200 |
| 220 lb (100 kg) | 160 | 200 | 220 |
The top of the range is a reasonable cushion on a vegan diet, since plant protein is slightly less digestible. Get your own number from the protein calculator.
Best vegan protein sources for muscle
The ISSN suggests each protein dose contain 700-3,000 mg of leucine, the amino acid that most strongly switches on muscle protein synthesis. Here's what common vegan foods deliver (USDA):
| Food | Portion | Calories (kcal) | Protein (g) | Leucine (g) |
|---|---|---|---|---|
| Tempeh | 150 g (5.3 oz) | 288 | 30.4 | 2.15 |
| Soy protein isolate | 1 oz (28 g) | 95 | 25.0 | 1.92 |
| Firm tofu, calcium sulfate | 1/2 cup (126 g) | 181 | 21.8 | 1.75 |
| Edamame | 1 cup (155 g) | 188 | 18.5 | 1.15 |
| Lentils, cooked | 1 cup (198 g) | 230 | 17.9 | 1.29 |
| Black beans, cooked | 1 cup (172 g) | 227 | 15.2 | 1.22 |
| Hemp hearts | 3 tbsp (30 g) | 166 | 9.5 | 0.65 |
| For comparison: chicken breast, roasted | 100 g (3.5 oz) | 165 | 31.0 | 2.33 |
Seitan is made from vital wheat gluten, which is about 75% protein dry (22.5 g per 30 g). Prepared seitan varies by recipe, so use the label. Wheat protein is low in lysine, so pair seitan with beans, lentils or soy across the day.
Protein powders make high targets much easier. Whey is about 11% leucine and pea isolate about 7%, so a slightly bigger scoop of pea, or a pea and rice blend, brings a plant shake close to whey. More detail in whey vs plant protein and our complete guide to vegan protein sources.
How many calories to eat for a vegan bulk
The same review recommends a surplus of about 10-20% over maintenance, with a target gain of about 0.25-0.5% of body weight per week for beginner and intermediate lifters. Advanced lifters should stay closer to the low end.
- 150 lb (68 kg): about 0.4-0.75 lb (0.17-0.34 kg) a week
- 200 lb (91 kg): about 0.5-1.0 lb (0.23-0.45 kg) a week
Find your maintenance with the TDEE calculator, then add 10-20%.
The hard part on a vegan bulk is often fullness: beans, grains and vegetables are filling for their calories. Calorie-dense foods help:
| Food (USDA) | Portion | Calories (kcal) | Protein (g) |
|---|---|---|---|
| Canned coconut milk | 1 cup (226 g) | 445 | 4.6 |
| Avocado | 1 whole (201 g) | 322 | 4.0 |
| Oats, dry | 80 g (about 1 cup) | 303 | 10.5 |
| Medjool dates | 4 dates (96 g) | 266 | 1.7 |
| Olive oil | 2 tbsp (27 g) | 239 | 0 |
| Almond butter | 2 tbsp (32 g) | 196 | 6.7 |
| Peanut butter | 2 tbsp (32 g) | 191 | 7.1 |
| Tahini | 2 tbsp (30 g) | 178 | 5.1 |
| Hemp hearts | 3 tbsp (30 g) | 166 | 9.5 |
Sample vegan bulking day
This day is built for a 200 lb (91 kg) lifter with maintenance around 2,600 calories. Every number is from USDA entries.
| Meal | Foods | Calories (kcal) | Protein (g) |
|---|---|---|---|
| Breakfast | 80 g oats, 1 cup fortified soymilk, 1 medium banana, 2 tbsp peanut butter, 1 oz soy protein isolate | 775 | 51 |
| Lunch | 1 cup cooked lentils, 1 cup brown rice, 1/2 cup firm tofu, 1 tbsp olive oil, 1 tbsp tahini | 868 | 48 |
| Dinner | 150 g tempeh, 1 cup cooked quinoa, 1 cup edamame | 698 | 57 |
| Snack | 2 slices whole-wheat bread, 2 tbsp almond butter, 3 tbsp hemp hearts | 524 | 24 |
| Day total | 2,864 | 180 |
That's about a 10% surplus, 2.0 g/kg of protein, about 125 g of fat (1.4 g/kg) and 291 g of carbs (3.2 g/kg), all inside the ranges from the bodybuilding review. It also brings in about 37 mg of iron and around 1,900 mg of calcium, most of the calcium from the calcium-set tofu and soymilk. Swap foods freely, but keep a big protein source at every meal. For ready-to-cook versions, see our vegan meal prep plan.
Supplements worth considering
- Creatine monohydrate, 3-5 g a day. Meat is the main dietary source, so vegetarians start lower: about 117 vs 130 mmol/kg of total muscle creatine in one study (Burke 2003), and they gained more lean tissue than meat eaters when both took creatine. The ISSN considers creatine safe for healthy people.
- Vitamin B12. The adult RDA is 2.4 mcg, and plant foods don't provide it reliably unless fortified. See our vitamin B12 guide for vegans.
- Vitamin D. The RDA is 600 IU (15 mcg) for adults up to 70. Needs depend on sun exposure, so a blood test is the best guide.
- Iodine. The RDA is 150 mcg. Iodized salt or a supplement covers it; seaweed is unreliable because amounts vary a lot.
- Algae oil (EPA and DHA). Plant foods supply ALA but almost no EPA or DHA.
- Beta-alanine, 3-5 g a day. Vegetarian diets tend to mean lower muscle carnosine (Rogerson 2017), and beta-alanine may help with high-rep work.
Check with your doctor before starting supplements, especially if you take medication or have a health condition.
Micronutrients to watch
- Iron. The NIH says vegetarians need 1.8 times the usual iron because plant iron is absorbed less well: about 14.4 mg a day for men and 32.4 mg for women aged 19-50. Pair lentils, tofu and greens with vitamin C. More in iron for vegetarians.
- Zinc. The RDA is 11 mg for men and 8 mg for women, and the NIH notes vegetarians may need up to 50% more because of phytates. Hemp hearts, tofu, lentils and oats help.
- Calcium. Calcium-set tofu and fortified plant milks are the easiest sources. Check labels: some tofu is set with nigari and has far less calcium.
Tracking a vegan bulk
Bulking on plants means eating larger portions than you're used to, and it's easy to land short when you guess. Logging for a few weeks shows whether you're really hitting your protein and surplus. Set your targets with the macro calculator, then log every meal.
We make Nutrify, so here's how it fits: you can photograph a meal and add a note about the tofu type or the oil, scan barcodes on protein powder, tofu and plant milk, and save your regular meals so the same breakfast logs in a tap. Nutrify has a 7-day free trial, then a paid subscription.
Sources
- Iraki J, et al. Nutrition recommendations for bodybuilders in the off-season: a narrative review. Sports (Basel). 2019;7(7):154.
- Jäger R, et al. International Society of Sports Nutrition position stand: protein and exercise. J Int Soc Sports Nutr. 2017;14:20.
- Morton RW, et al. A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength. Br J Sports Med. 2018;52(6):376-384.
- Hevia-Larraín V, et al. High-protein plant-based diet versus a protein-matched omnivorous diet to support resistance training adaptations. Sports Med. 2021;51(6):1317-1330.
- Babault N, et al. Pea proteins oral supplementation promotes muscle thickness gains during resistance training. J Int Soc Sports Nutr. 2015;12(1):3.
- Gorissen SHM, et al. Protein content and amino acid composition of commercially available plant-based protein isolates. Amino Acids. 2018;50(12):1685-1695.
- Reed KE, et al. Neither soy nor isoflavone intake affects male reproductive hormones. Reprod Toxicol. 2021;100:60-67.
- Burke DG, et al. Effect of creatine and weight training on muscle creatine and performance in vegetarians. Med Sci Sports Exerc. 2003;35(11):1946-55.
- Kreider RB, et al. ISSN position stand: safety and efficacy of creatine supplementation. J Int Soc Sports Nutr. 2017;14:18.
- Rogerson D. Vegan diets: practical advice for athletes and exercisers. J Int Soc Sports Nutr. 2017;14:36.
- NIH Office of Dietary Supplements fact sheets: iron, zinc, vitamin B12, vitamin D, iodine.
- USDA FoodData Central, SR Legacy: tempeh, FDC 174272; soy protein isolate, FDC 174276; tofu, firm, calcium sulfate, FDC 172475; edamame, FDC 168411; lentils, FDC 172421; black beans, FDC 173735; hemp seed, FDC 170148; vital wheat gluten, FDC 168147; chicken breast, roasted, FDC 171477; coconut milk, canned, FDC 170173; avocado, FDC 171705; oats, FDC 173904; medjool dates, FDC 168191; olive oil, FDC 171413; almond butter, FDC 168588; peanut butter, FDC 172470; tahini, FDC 170189; soymilk, fortified, FDC 175215; banana, FDC 173944; brown rice, cooked, FDC 169704; quinoa, cooked, FDC 168917; whole-wheat bread, FDC 172688.
