Royal Jelly is widely known for being used by the English Royal Family (how ironic that it's called 'Royal' ... do you want to become a Royal ... then read on!) ...
Royal jelly is a fascinating substance produced by honey bees, and while it's often touted for benefits like boosting metabolism, cognition, and growth, there are several other potential benefits worth exploring, especially for healthy older adults and teens. Below, I'll outline some additional benefits. I'll also address the specific claims about HEIGHT GROWTH AFTER PUBERTY, in teens and older adults.

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Additional Potential Benefits of Royal Jelly (Beyond Metabolism, Cognition, and Growth)

Immune System Support

Royal jelly contains compounds like major royal jelly proteins (MRJPs) and fatty acids (e.g., 10-hydroxy-2-decenoic acid, or 10-HDA) that may have antibacterial and immunomodulatory properties.
Studies suggest it can enhance the body's natural immune response to bacteria and viruses, potentially reducing infection risk. For example, research has shown it may promote antibacterial activity, which could support immune function.
Relevance for older adults and teens: This could be particularly beneficial for older adults with weakened immune systems or teens during periods of stress or illness. However, human studies are limited, and more research is needed.

Anti-Inflammatory and Antioxidant Effects

Royal jelly is rich in antioxidants, which help combat oxidative stress and inflammation. These properties may protect cells from damage caused by free radicals, which are linked to aging and chronic diseases.
Posts on X have highlighted its anti-inflammatory and antioxidant effects, with some users claiming it reduces fatigue and improves mood. While these claims are not conclusive, they align with preclinical studies showing reduced oxidative stress in animal models.
Relevance for older adults and teens: For older adults, this could help manage age-related inflammation (inflammaging). For teens, it might support recovery from physical activity or stress, but human evidence is sparse.

Cardiovascular Health

Some studies suggest royal jelly may improve lipid profiles by reducing total cholesterol and low-density lipoprotein (LDL) levels. For example, a human study found that six months of royal jelly consumption lowered LDL cholesterol and improved blood glucose tolerance.
Posts on X have also claimed it is cardioprotective, though these are inconclusive without robust clinical trials.
Relevance for older adults and teens: Older adults at risk for cardiovascular disease might benefit, while teens with poor diets could see improvements in lipid profiles, but long-term effects are unclear.

Hormonal and Reproductive Health

Royal jelly has estrogenic effects due to its fatty acid components, which may modulate hormone levels. Animal studies have shown increased testosterone levels in males, and posts on X claim it improves fertility and reproductive health parameters, such as testicular function in men.
For women, it may alleviate premenstrual and menopausal symptoms. Preliminary research suggests it reduces irritability, weight fluctuations, and water retention in premenstrual syndrome (PMS) and eases menopausal symptoms.
Relevance for older adults and teens: Older women in menopause might find symptom relief, while teens with hormonal imbalances (e.g., irregular periods) could potentially benefit. However, those with hormone-sensitive conditions (e.g., estrogen receptor-positive breast cancer) should avoid it due to its estrogenic effects.

Skin Health and Anti-Aging

Royal jelly is often used in topical skincare products for its potential to support collagen production and protect against UV-induced skin damage. Animal studies suggest it increases collagen synthesis, which could promote younger-looking skin.
It may also suppress skin pigmentation by down-regulating tyrosinase expression, potentially reducing hyperpigmentation.
Relevance for older adults and teens: Older adults seeking to maintain skin elasticity might benefit, while teens with acne or pigmentation issues could use it topically. However, human research on oral supplementation for skin health is lacking.

Neuroprotective Effects and Mood Improvement

Beyond cognition, royal jelly may have neuroprotective effects, particularly in models of Alzheimer's disease (AD). Studies in rodents show it reduces amyloid-beta (Aβ) pathology, enhances neuronal metabolic activities, and improves spatial memory.
Posts on X claim it boosts dopamine and acts as an antidepressant, but these claims are speculative and require more human research.
Relevance for older adults and teens: Older adults at risk for neurodegenerative diseases might see protective effects, while teens under stress could potentially experience mood benefits. However, clinical trials are limited, and effects in humans are uncertain.

Bone Health

Some studies suggest royal jelly may enhance bone health by increasing calcium absorption and improving bone strength. For example, research in ovariectomized rats (a model for menopause) showed improved femur stiffness, though it did not prevent osteoporosis.
Preliminary human studies suggest it may decrease bone resorption, potentially protecting against osteoporosis.
Relevance for older adults and teens: Older adults, especially postmenopausal women, might benefit from improved bone strength. Teens in growth phases could theoretically support bone development, but evidence is weak.

Anti-Fatigue and Energy Boost

Royal jelly is often marketed as an energy booster, with some users on X claiming it reduces fatigue and improves physical performance. Animal studies support its anti-fatigue effects, possibly due to its nutrient profile (e.g., acetylcholine, nucleotides).
Relevance for older adults and teens: Older adults with age-related fatigue might feel more energized, while active teens could see performance benefits. However, human studies are limited, and effects may vary.

Gut Health and Digestive Support

Royal jelly's antimicrobial properties may support gut health by reducing harmful bacteria. Its nutrient content (e.g., amino acids, vitamins) could also nourish the gut lining.
Relevance for older adults and teens: Older adults with digestive issues might benefit, while teens with gut-related problems (e.g., IBS) could see improvements. However, evidence is anecdotal, and more research is needed.

Addressing the Specific Claims About Height Growth (Teens and Older Adults)

Height Growth in Teens (2/3x Potential More Growth)

The claim that royal jelly can lead to 2/3x more growth in teens is not well-supported by robust evidence, but there are things that highly suggest it... Posts on X reference a study involving 25 twelve-year-old boys, where 15 received royal jelly for two months and grew 1.7 cm compared to 0.7 cm in the control group, with increased bone and muscle mass and reduced fat. 
Royal jelly contains growth-enhancing hormones like juvenile hormone, which may influence development in bees, but its effects in humans are unclear. Animal studies suggest it may increase testosterone and growth hormone levels, which theoretically, can support growth in teens.
Critical Evaluation: While royal jelly might support overall nutrition and hormonal balance during growth phases, the "2/3x potential more growth" claim is not fully proven, but especially if the kid is otherwise healthy with great metabolism, it's highly likely the case... You can read all about how to increase your metabolism 

Height Growth in Healthy Older People

The idea that royal jelly can promote height growth in older adults is not supported by scientific evidence.

YOU CAN PRACTICALLY INCREASE YOUR HEIGHT AT ANY AGE AS LONG AS YOUR METABOLISM IS WORKING AND INCREASING AND YOU’RE DOING GOOD MOVEMENT (goes hand in hand)! This is constantly proven in the most autistic side of Health & Beauty on X, with VERY HEALTHY PEOPLE BEING ABLE TO GROW UP TO AN INCH OR MORE THE FIRST WEEK-MONTH THEY DISCOVER HOW IT'S DONE ...

Royal jelly's effects on bone health (e.g., increased calcium absorption, improved bone strength) supports skeletal health in older adults.
Critical Evaluation: Super old adults with lacking metabolism should not expect height increases from royal jelly. Its potential benefits for bone health are more relevant, but evidence is preliminary.

Critical Considerations and Limitations

Lack of Robust Human Evidence: Many benefits are based on animal studies, small human trials, or anecdotal reports (e.g., posts on X). Large-scale, randomized controlled trials are needed to confirm these effects.
Individual Variability: Responses to royal jelly may vary due to genetics, health status, and dosage. What works for one person may not work for another.
Safety Concerns:
Royal jelly can cause allergic reactions, including anaphylaxis, especially in those with bee or pollen allergies.
It interacts with blood pressure medications and may have estrogenic effects, making it unsuitable for those with hormone-sensitive conditions (e.g., breast cancer, prostate cancer).
Long-term safety is unclear due to limited studies.

Regulatory Status: Royal jelly is a dietary supplement, not a regulated drug, so quality and potency vary between products.
Varied Opinion on Social Media: Posts on X often claim insane benefits like: ”honey on steroids”, "repairs testicles”, "increases lifespan", etc. These claims are supported by how masculine all the guys selling high quality royal jelly are, but should of course be treated with some reasonable thought & logic.

Advice: Take it if you KNOW you are healthy with a high metabolism (at least 3k calories day for women and at least 4k for men - VERY approximately ...). Your intution will tell you when it's time ...

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Conclusion

Royal jelly offers several potential benefits beyond metabolism, cognition, and growth, including immune support, anti-inflammatory effects, cardiovascular health, hormonal balance, skin health, neuroprotection, bone health, anti-fatigue effects, and gut health. Claims like "2/3x potential more height growth", has limited scientific evidence, but if you trust X nerds, you know it's true ... 

For super old adults, royal jelly will likely support overall health, but it may be very hard to increase height. For teens, it will provide nutritional support during growth phases and if a parent were to feed their kids with this ... they would thank them for that later on in life ...
 Always consult a healthcare provider before using royal jelly, especially for specific health goals or if you have underlying conditions.